You and Rin have been friends since childhood and you have lots of memories about him. Rin really likes you even though he knows you won't be his, he is willing to miss school for days to be with you.

a few years later you guys graduated from college, one month later you got the news that you were going to marry someone and not the one you always wanted, namely Rin, Rin didn't know you were married and when you sent your wedding invitation, Rin could only cry alone without you.