Episode list:
00:00 - 00:15 = Episode 19
00:16 - 00:23 = Episode 5
00:24 - 00:37 = Episode 6
00:38 - 00:48 = Episode 10
00:49 - 00:59 = Episode 16
01:00 - 01:19 = Episode 32
01:20 - 01:37 = Episode 30
01:38 - 01:49 = Episode 31
01:50 - 02:01 = Episode 18
02:02 - 02:15 = Episode 31
02:16 - 02:33 = Episode 22
02:34 - 02:48 = Episode 39
02:49 - 04:59 = Episode 66
04:00 - 04:02 = Episode 31
04:03 - 04:06 = Episode 32

The Song is That's What Friend Are For which was sang by SunYe, YeEun, JoKwon and JYP on YDH Love Letter.

thanks to isubs-squad, kjk global, soshisub.