1 | 행복 (Happiness)- assistant recording engineer:
- 이인규
- recording engineer:
- 구종필 and Yoo, Young Jin
- programming:
- Maxx Song
- producer:
- Chad Hugo and Will Simms
- mixer:
- 구종필
- additional editor:
- 이지홍, Maxx Song and Yoo, Young Jin
- background vocals:
- Red Velvet and Anne Judith Wik
- vocals:
- IRENE , JOY , SEULGI and WENDY
- performer:
- Red Velvet
- arranger:
- Chris Holsten, Chad Hugo, Will Simms and Anne Judith Wik
- vocals arranger:
- Maxx Song and Yoo, Young Jin
- phonographic copyright (℗) by:
- SM Entertainment Co., Ltd.
- recorded at:
- SM BOOMINGSYSTEM in South Korea and SM Yellow Tail Studio in South Korea
- mixed at:
- SM Yellow Tail Studio in South Korea
- edited at:
- doobdoob Studio in South Korea and SM BOOMINGSYSTEM in South Korea
- music videos:
- 행복 (Happiness) by Red Velvet
- recording of:
- 행복 (Happiness)
- lyricist:
- Yoo, Young Jin
- composer:
- Chris Holsten, Chad Hugo, Will Simms and Anne Judith Wik
- publisher:
- Universal Music Publishing Korea and Universal Music Publishing MGB Korea
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