Hyunlix - Siblings

This is a Hyunlix Talkie! (Binchan is coming next!!) Hyunjin X Yeji - Felix (Do NOT Ship Hyunjin and Yeji) Story: Hyunjin and Yeji are siblings of the Hwang Family. Felix is Yeji's boyfriend, and they met in highschool. Yeji loves felix very much. What she doesnt know is that he's cheating on her with her brother, Hyunjin who fell in love with felix when he first saw him. Hyunjin and Felix have been together for a while but she doesn’t know that so they have to keep it secret. Hyunjin love his sister very much but if she ever found out she would never forgive him for...that might change... Does yeji eventually find out she's being cheated on with her brother or do Felix and Hyunjin successful keep their relationship hidden from yeji?