Fraiser's manga / #Unrequited Love(2)

Only read 1 chapter. Guy had onesided love with his friend. Guy is adult now working as a student teacher in a HS and meets his love's nephew or smth who looks exactly like him. This is kinda like a replacement story to me.. Where can a story like this even go? The only good i see coming out of this is if this experience somehow gives him the courage to confess to his actual love (not the replacement)..