diff --git a/music_quiz/data/mq/function/commands/start.mcfunction b/music_quiz/data/mq/function/commands/start.mcfunction
index 8e08a05..ae5cdc1 100644
--- a/music_quiz/data/mq/function/commands/start.mcfunction
+++ b/music_quiz/data/mq/function/commands/start.mcfunction
@@ -38,4 +38,8 @@ function mq:quiz/stop_sound
 $scoreboard players set max_index main $(max_index)
 scoreboard players set init main 1
 
+# 시작 시 1..preload 번 영상 캐시 미리받기. schedule 로 다음 tick(서버 소스)에
+# 실행해 videoCache add 권한 보장 + max_index 설정 이후 동작 보장.
+schedule function mq:videos/cache/preload 1t
+
 dialog show @a mq:page1
diff --git a/music_quiz/data/mq/function/init/config.mcfunction b/music_quiz/data/mq/function/init/config.mcfunction
index 4a5a6bd..a461b42 100644
--- a/music_quiz/data/mq/function/init/config.mcfunction
+++ b/music_quiz/data/mq/function/init/config.mcfunction
@@ -19,16 +19,22 @@ data modify storage mq:main audio set value {namespace: "musicquiz", source: "re
 data modify storage mq:main image set value {namespace: "mq", x: 2782, y: 88, z: 5979, facing: 2b}
 
 # 정답 영상 — 모드의 영상 재생 관련
-# namespace        — 영상 아이디를 제외한 주소 (마지막에 /는 없어야함)
+# namespace        — 영상 아이디를 제외한 주소 (마지막 / 는 자동으로 제거됨)
 # x,y,z            — 영상 블럭 좌표 (벽면 앞쪽 블록 위치)
 # w,h              — 영상 가로세로 크키 (왼쪽아래 기준)
 # facing           — 영상이 바라보는 방향: south / west / north / east
 # sound            — 영상 소리 설정 (0~100, 음소거: -1)
+# preload          — 게임 시작 시 미리 받아둘 영상 캐시 갯수 (1번부터 N번까지).
+#                    재생 중에도 항상 N개 앞까지 미리 받아둠. 0 이면 미리받기 끔(매번 URL 재생)
+# keep             — 캐시 유지 갯수(FIFO). 이 값을 넘기면 가장 먼저 받은 캐시부터 삭제.
+#                    메모리 관리용이므로 preload 보다 크거나 같게 설정 권장
 data modify storage mq:main video set value { \
   namespace: "https://video.tkrmagid.kr/api/video/폴더1/폴더2", \
   cmd_x: 2769, cmd_y: 73, cmd_z: 5965, \
   x: 2731, y: 96, z: 6034, facing: "north", w: 25,h: 14, \
-  sound: -1 \
+  sound: -1, \
+  preload: 5, \
+  keep: 10 \
 }
 
 # 곡 개수 max_index 는 init/songs.mcfunction 의 길이로 자동 계산됨
diff --git a/music_quiz/data/mq/function/load.mcfunction b/music_quiz/data/mq/function/load.mcfunction
index ad233a9..7831eb6 100644
--- a/music_quiz/data/mq/function/load.mcfunction
+++ b/music_quiz/data/mq/function/load.mcfunction
@@ -3,6 +3,7 @@ data merge storage func:temp {}
 data merge storage mq:tmp {}
 
 function mq:init/config
+function mq:videos/normalize
 function mq:init/songs
 function mq:init/buttons
 function mq:init/triggers
diff --git a/music_quiz/data/mq/function/videos/cache/add.mcfunction b/music_quiz/data/mq/function/videos/cache/add.mcfunction
index 8d6e0c7..b3ace99 100644
--- a/music_quiz/data/mq/function/videos/cache/add.mcfunction
+++ b/music_quiz/data/mq/function/videos/cache/add.mcfunction
@@ -1,9 +1,12 @@
-data modify storage mq:tmp video set from storage mq:main video
+# 재생 진행에 맞춰 항상 preload 개 앞까지 캐시를 채운다.
+# 현재 index 에서 (preload-1) 만큼 앞선 영상을 받아두면 시작 시 preload(1..N)
+# 와 합쳐져 N개 버퍼가 굴러간다.
+execute store result score cache_preload func.temp run data get storage mq:main video.preload
+execute if score cache_preload func.temp matches ..0 run return 0
 
-scoreboard players operation cache_idx func.temp = index main
-scoreboard players add cache_idx func.temp 1
-execute store result storage mq:tmp video.cache_num int 1 run scoreboard players get cache_idx func.temp
+scoreboard players operation cache_target func.temp = index main
+scoreboard players operation cache_target func.temp += cache_preload func.temp
+scoreboard players remove cache_target func.temp 1
+execute if score cache_target func.temp > max_index main run return 0
 
-execute store result storage mq:tmp video.num int 1 run scoreboard players get index main
-data modify storage mq:tmp video.cmd set value "cache"
-function mq:videos/macro/cmd with storage mq:tmp video
+function mq:videos/cache/add_one
diff --git a/music_quiz/data/mq/function/videos/cache/add_one.mcfunction b/music_quiz/data/mq/function/videos/cache/add_one.mcfunction
new file mode 100644
index 0000000..08b7d4d
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/add_one.mcfunction
@@ -0,0 +1,4 @@
+# cache_target(func.temp) 번 영상을 캐시에 추가. 매크로로 넘겨 등록/추적/축출.
+data modify storage mq:tmp video set from storage mq:main video
+execute store result storage mq:tmp video.num int 1 run scoreboard players get cache_target func.temp
+function mq:videos/cache/macro/add_one with storage mq:tmp video
diff --git a/music_quiz/data/mq/function/videos/cache/clear.mcfunction b/music_quiz/data/mq/function/videos/cache/clear.mcfunction
index 4fda891..4edbb2f 100644
--- a/music_quiz/data/mq/function/videos/cache/clear.mcfunction
+++ b/music_quiz/data/mq/function/videos/cache/clear.mcfunction
@@ -1 +1,5 @@
-function mq:videos/macro/custom {cmd: "videoCache clear"}
+# 추적 목록을 비우고, 다음 tick 에 서버 소스로 전체 캐시 wipe.
+# (videoCache clear 를 호출자 소스에서 바로 실행하면 player/비OP 소스일 때
+# 권한 문제가 날 수 있어 schedule 로 서버 소스 보장.)
+data modify storage mq:main video.cached set value []
+schedule function mq:videos/cache/clear_run 1t
diff --git a/music_quiz/data/mq/function/videos/cache/clear_run.mcfunction b/music_quiz/data/mq/function/videos/cache/clear_run.mcfunction
new file mode 100644
index 0000000..37bb540
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/clear_run.mcfunction
@@ -0,0 +1 @@
+videoCache clear
diff --git a/music_quiz/data/mq/function/videos/cache/evict.mcfunction b/music_quiz/data/mq/function/videos/cache/evict.mcfunction
new file mode 100644
index 0000000..d6a245f
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/evict.mcfunction
@@ -0,0 +1,4 @@
+# 캐시 갯수가 keep 을 넘으면 가장 먼저 받은 것부터(FIFO) 삭제.
+execute store result score cache_len func.temp run data get storage mq:main video.cached
+execute store result score cache_keep func.temp run data get storage mq:main video.keep
+execute if score cache_len func.temp > cache_keep func.temp run function mq:videos/cache/evict_one
diff --git a/music_quiz/data/mq/function/videos/cache/evict_one.mcfunction b/music_quiz/data/mq/function/videos/cache/evict_one.mcfunction
new file mode 100644
index 0000000..8ba4d5d
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/evict_one.mcfunction
@@ -0,0 +1,5 @@
+execute store result storage mq:tmp evict_num int 1 run data get storage mq:main video.cached[0].i
+function mq:videos/cache/macro/evict_one with storage mq:tmp
+data remove storage mq:main video.cached[0]
+# keep 보다 여러 개 초과해 있을 수 있으니 재귀로 다시 검사.
+function mq:videos/cache/evict
diff --git a/music_quiz/data/mq/function/videos/cache/macro/add_one.mcfunction b/music_quiz/data/mq/function/videos/cache/macro/add_one.mcfunction
new file mode 100644
index 0000000..4cc7a55
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/macro/add_one.mcfunction
@@ -0,0 +1,7 @@
+# 이미 받은 영상이면(추적 목록에 {i:num} 존재) 건너뜀.
+$execute if data storage mq:main video.cached[{i:$(num)}] run return 0
+# videoCache add 는 서버 소스(또는 OP)에서 직접 실행. preload/select 모두 서버
+# 소스이므로 command_block 우회 없이 바로 호출 가능.
+$videoCache add video_$(num) $(namespace)/$(num)
+$data modify storage mq:main video.cached append value {i:$(num)}
+function mq:videos/cache/evict
diff --git a/music_quiz/data/mq/function/videos/cache/macro/evict_one.mcfunction b/music_quiz/data/mq/function/videos/cache/macro/evict_one.mcfunction
new file mode 100644
index 0000000..a5fb796
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/macro/evict_one.mcfunction
@@ -0,0 +1 @@
+$videoCache remove video_$(evict_num)
diff --git a/music_quiz/data/mq/function/videos/cache/preload.mcfunction b/music_quiz/data/mq/function/videos/cache/preload.mcfunction
new file mode 100644
index 0000000..5b9b5bc
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/preload.mcfunction
@@ -0,0 +1,5 @@
+# 게임 시작 시 1번부터 preload 번까지 캐시를 미리 받는다 (max_index 로 상한).
+scoreboard players set cache_i func.temp 1
+execute store result score cache_max func.temp run data get storage mq:main video.preload
+execute if score cache_max func.temp > max_index main run scoreboard players operation cache_max func.temp = max_index main
+function mq:videos/cache/preload_loop
diff --git a/music_quiz/data/mq/function/videos/cache/preload_loop.mcfunction b/music_quiz/data/mq/function/videos/cache/preload_loop.mcfunction
new file mode 100644
index 0000000..72e2bc7
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/cache/preload_loop.mcfunction
@@ -0,0 +1,5 @@
+execute if score cache_i func.temp > cache_max func.temp run return 0
+scoreboard players operation cache_target func.temp = cache_i func.temp
+function mq:videos/cache/add_one
+scoreboard players add cache_i func.temp 1
+function mq:videos/cache/preload_loop
diff --git a/music_quiz/data/mq/function/videos/macro/cmd.mcfunction b/music_quiz/data/mq/function/videos/macro/cmd.mcfunction
index 743e18e..3110718 100644
--- a/music_quiz/data/mq/function/videos/macro/cmd.mcfunction
+++ b/music_quiz/data/mq/function/videos/macro/cmd.mcfunction
@@ -2,15 +2,11 @@ $execute if data storage mq:tmp {video:{cmd:"delete"}} run setblock $(cmd_x) $(c
   Command:"videoDelete $(x) $(y) $(z)", \
   auto:0b \
 }
-$execute if data storage mq:tmp {video:{cmd:"num"}} run setblock $(cmd_x) $(cmd_y) $(cmd_z) minecraft:command_block[conditional=false,facing=up]{ \
-  Command:"videoPlace $(x) $(y) $(z) $(facing) $(w) $(h) $(sound) video_$(num)", \
+$execute if data storage mq:tmp {video:{cmd:"play"}} run setblock $(cmd_x) $(cmd_y) $(cmd_z) minecraft:command_block[conditional=false,facing=up]{ \
+  Command:"videoPlace $(x) $(y) $(z) $(facing) $(w) $(h) $(sound) $(src)", \
   auto:0b \
 }
-$execute if data storage mq:tmp {video:{cmd:"cache"}} run setblock $(cmd_x) $(cmd_y) $(cmd_z) minecraft:command_block[conditional=false,facing=up]{ \
-  Command:"videoCache add video_$(num) $(namespace)/$(cache_num)", \
-  auto:0b \
-}
-$execute if data storage mq:tmp {video:{cmd:"cmd"}} run setblock $(cmd_x) $(cmd_y) $(cmd_z) minecraft:command_block[conditional=false,facing=up]{ \
+$execute if data storage mq:tmp {video:{cmd:"custom"}} run setblock $(cmd_x) $(cmd_y) $(cmd_z) minecraft:command_block[conditional=false,facing=up]{ \
   Command:"$(cmd_value)", \
   auto:0b \
 }
diff --git a/music_quiz/data/mq/function/videos/macro/custom.mcfunction b/music_quiz/data/mq/function/videos/macro/custom.mcfunction
deleted file mode 100644
index c17805c..0000000
--- a/music_quiz/data/mq/function/videos/macro/custom.mcfunction
+++ /dev/null
@@ -1,6 +0,0 @@
-function mq:videos/clear
-data modify storage mq:tmp video set from storage mq:main video
-execute store result storage mq:tmp video.num int 1 run scoreboard players get index main
-data modify storage mq:tmp video.cmd set value "custom"
-$data modify storage mq:tmp video.cmd_value set value "$(cmd)"
-function mq:videos/macro/cmd with storage mq:tmp video
diff --git a/music_quiz/data/mq/function/videos/macro/resolve_src.mcfunction b/music_quiz/data/mq/function/videos/macro/resolve_src.mcfunction
new file mode 100644
index 0000000..bad9340
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/macro/resolve_src.mcfunction
@@ -0,0 +1,8 @@
+# mq:tmp video.src 를 결정한다.
+#   - 기본: 전체 URL "<namespace>/<num>"
+#   - mq:main video.cached 목록에 {i:num} 이 있으면(=videoCache add 로 등록됨)
+#     등록 이름 "video_<num>" 사용 → 모드가 서버 config 에서 URL 로 resolve.
+# cached 목록은 데이터팩이 videoCache add/remove 와 1:1 로 직접 추적하므로
+# 모드에 캐시 존재 여부를 묻지 않고도 정확하다.
+$data modify storage mq:tmp video.src set value "$(namespace)/$(num)"
+$execute if data storage mq:main video.cached[{i:$(num)}] run data modify storage mq:tmp video.src set value "video_$(num)"
diff --git a/music_quiz/data/mq/function/videos/normalize.mcfunction b/music_quiz/data/mq/function/videos/normalize.mcfunction
new file mode 100644
index 0000000..b9a47b1
--- /dev/null
+++ b/music_quiz/data/mq/function/videos/normalize.mcfunction
@@ -0,0 +1,7 @@
+# namespace 끝에 / 가 붙어 있으면 제거 (config 오타 방어).
+# string 소스 마지막 글자만 떼서 비교 후, 맞으면 마지막 글자를 잘라낸다.
+data modify storage mq:tmp ns_last set string storage mq:main video.namespace -1
+execute if data storage mq:tmp {ns_last:"/"} run data modify storage mq:main video.namespace set string storage mq:main video.namespace 0 -1
+
+# 캐시 추적 목록 초기화 (videoCache add/remove 와 1:1 로 관리되는 {i:N} 리스트)
+data modify storage mq:main video.cached set value []
diff --git a/music_quiz/data/mq/function/videos/show.mcfunction b/music_quiz/data/mq/function/videos/show.mcfunction
index e52e228..d52af10 100644
--- a/music_quiz/data/mq/function/videos/show.mcfunction
+++ b/music_quiz/data/mq/function/videos/show.mcfunction
@@ -1,5 +1,10 @@
-function mq:videos/clear
+# 정답 영상 재생. videoPlace 는 같은 앵커 좌표를 덮어쓰므로 별도 clear 불필요
+# (clear + place 를 한 tick 에 하면 command_block 이 한 번만 켜져 place 가 씹힘).
 data modify storage mq:tmp video set from storage mq:main video
 execute store result storage mq:tmp video.num int 1 run scoreboard players get index main
-data modify storage mq:tmp video.cmd set value "num"
+
+# 캐시가 있으면 video_N(등록된 이름), 없으면 전체 URL 로 src 결정
+function mq:videos/macro/resolve_src with storage mq:tmp video
+
+data modify storage mq:tmp video.cmd set value "play"
 function mq:videos/macro/cmd with storage mq:tmp video