FLs who love someone else at first

Now, this can range from the FL just being interested to genuinely loving the other male character. There are some dramas where her situation is unrequited love and in some, they get engaged or are romantically together throughout the beginning of the drama. I also included those which only show the FL being in love with someone else in flashbacks as that was in the past. 

So basically, there are, the FL getting in a relationship with another during the beginning of the drama and there are also, the FL having a boyfriend she loved who does something bad so they break up and then FLs who aren't getting further than just loving that other guy from afar for sometime before slowly falling for the ML.