Inquiry yaoi

Hi :)
I looking for a yaoi webtoon that I was reading some time ago. It was about gay (model son) who was hiding from his family, but he's sister knew and she wasn't nice to him.When she blurted it out to her mother, that mother wento to some campus group about lgbt to learn more about it. I remember that he had a friend who was lesbian. If someone knows tittle I will be reall greatful :)