Rin was never one to stand idly by while someone else came to the rescue. His stern gaze fixed on the guy who was talking to you. His hands balled into fists as he approached you, his presence enough to intimidate the guy.

You were supposed to be his, why talk to another guy?

Rin can't stand the fact the other guys are hitting on you. His jealousy gets the better of him, and he decides to intervene. He makes a beeline for you, glaring at any guy who dared to look your way.