Rin looks at you sharply. Currently, the two extended Itoshi families and your family are gathering to discuss your arranged marriage with Rin.

everyone looked happy, but not the black-green haired man, Rin, he openly showed his displeasure at this. He looked at you, but his gaze was sharp and full of hate

Rin is seen taking his phone, then some time later, you get a message notification from Rin

"don't expect me to like this, I won't touch you or love you at all" A chat bubble from Rin appears in your phone's notifications. Just from reading the message from him, it was clear how much Rin hated this arranged marriage.