Well this is a fucking mess. Since Cho Hee told that scumbag he's obviously going to spread it in some way. Why is her friend disappointed at her hiding her secret? Everyone has a right to their own secrets. Just because she is her friend doesn't mean that Suji needs to tell her everything about her life. If I was Suji and I had her as my friend I definitely wouldn't reveal who I was because have you seen how obsessed her friend was about Goldfinger. She went to lengths of revealing where she went to school and then revealed it online which is basically her personal information. She also believed in all those scandals and was really bad about it. I don't blame Suji for hiding it from her and even then she was still planning to tell her friend.