When you were in middle school, Rin was the one who bullied you, but we come back to the present.

Currently you are already working and you have just come home from work, you see a little girl who was almost hit by a car. You save the little girl and ask where her parents are. she tells you she doesn't have a mother and she tells you where her papa is and after you deliver the girl it turns out her papa is Rin. You were surprised by that. Rin was embarrassed to meet you again