Wtf just happened? Why’d he confess to Han? Can someone explain this chapter

It’s just his personality. He would sacrifice everything for anyone. Like the accident he had before he knew it was the girl “it’s hubert but yeon soo thinks he was a girl” he knew before but pretended to not remembering the doer. That is why he simply confessed he wants to make his best friend happy even if he really don’t like him in that way

Actually i don’t think it’s his personality. My guessing is that something happened to him when he was young so he is traumatized or something