[Happy Ending] 　　Beautiful Life! 　　[Credit] 　　Executive Producer: MAKTUB Inc. 　　Producer: Maktub, 이라온 　　Directed by Maktub, 이라온 　　Lyrics by Maktub, 이라온 　　Composed by Maktub, 이라온 　　Arranged by Maktub, Triple Synergy, 박민지 　　Background Vocals & Arranged by Maktub, 이라온 　　Synthesizer Perfomed by Maktub 　　Piano Performed by Maktub, Triple Synergy, 송미선 　　Guitar Tommy Kim, 금상헌 　　All Sources Programming Maktub, Triple Synergy 　　Strings Performed by 융스트링 　　Recorded by Maktub (@ MAKTUB STUDIO) 　　Mixed by Maktub (@ MAKTUB STUDIO) 　　Mastered by 권남우 (@82_1 Sound), Maktub (@ MAKTUB STUDIO) 　　M/V Director Lee Beom (@LEEBEOM_FILMS) 　　Director of Photography Minu Park 　　Camera Assistant Sang moon Park 　　Art Director 박진