This is a solo song for Wheein.

Since 2018, MAMAMOO has been running a project that exhibits each one of the members' characters and depth: 4 Seasons project.

Other solo songs belong to this project are:
1. Be Calm (Hwasa’s solo in “Yellow Flower” album)
2. SELFISH (Moonbyul’s solo in “Red Moon” album)
3. HELLO (Solar’s solo in album “Blue;S”)

Mamamoo - Wikipedia — Wikipedia

Mamamoo ( Hangul: 마마무), sometimes stylized as MAMAMOO, is a South Korean girl group formed by RBW (formerly WA Entertainment) in 2014. The group officially debuted on June 19, 2014 with the single "Mr. Ambiguous". Their debut was considered by some critics as one of the best K-pop debuts of 2014.