ML likes someone else at first; Fl's Unrequited love

Exclusively mlw couples.

1. either ML likes someone else first before FL. and FL is already in love with ML
2. or FL is in love with ML, ML might not have feelings for someone else, but he doesn't have for FL either at the beginning 

personally i prefer this genre when everyone is good, fl is a good person, who happens to love ml, who is also a decent human and loves another woman/man , and the third person is also great :). just a realistic situation where one person happens to love some who loves someone else. just heather by conan grey. but ofc most dramas that have the trope of ml liking someone else isn't this "everyone is good" so ill just add everything i find in that category