FL has unrequited love for ML . ML loves someone else . ML can have one-sided love for this person or maybe in a relationship, cant get over break up, person has died, anything will do. ML's heart belongs to someone else. and FLs falls for ML and realizes he will not be hers

Bring it on ghost
Itaewon Class - here its a little bit more tricky since the trope does fit 2 characters at different time points.
Pinnocchio (highly recommend you this one)
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