최애

Your absolute favorite — most commonly used in K-pop fandom to describe your favorite member in a group. From 최고 (best) + 애정 (affection). More intense than just "favorite" — it's the one you'd go to war for.

최 = best (shortened from '최'고)

애정 = affection/love (shortened from '애'정)

See also: 차애, 원픽