Bias meaning in K-pop
최애 · say “BYE-us”
Your bias is your favorite member of a group.
What does Bias mean?
Fans use "bias" for the one member they like most. In Korean, the same idea is 최애, read choe-ae, which means "most loved".
An "ult bias" (ultimate bias) is your favorite idol across all groups.
Example
"My bias in SEVENTEEN is Hoshi."