1Happy Ending Intro (Acoustic Version)
2Happy Ending (Korean Version) [feat. 서지안 & J-ssoen]
3Happy Ending (Japanese Version) [feat. 서지안 & 레나]
4Happy Ending (Chinese Version) [feat. 서지안]
5Happy Ending Intro (Acoustic Version) [Instrumental]
6Happy Ending (Full Version) [Instrumental]
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