I'm sorry but Donghyun was the one who spilled the picture of Taejun and Seheon's dad to the school admin. As he said, because of greed. I think Seheon's dad already made the decision by risking for Taejun and even divorcing his wife. I think he just wanted to protect Taejun from being reprimanded that is why he had to separate from him. Then later on, Donghyun develops feelings for Seheon as well. THE NERVE OF THIS GUY. Right from the start, he already made a move on uncle and HE KNEW IT WASN'T TAEJUN. HE KNEW HE WAS NOT SLEEPING. He didn't even take action for it. UGH I JUST CAN'T FORGIVE HIM.
MATTHEW IS BEAUTIFULLY DRAWN IN THIS CHAPTER. HANDSOME IN DETAIL!