조화가 · 조화를
harmony, balance
Example
이 방은 색깔의 조화가 정말 좋아요.
The colors in this room go together really well.
Word parts
조 tune, adjust+화 harmony
Literally 'tuned into harmony', like instruments playing together.
Good to know
Homonym warning: 조화 can also mean 'artificial flower' (a different word).