People...please understand the difference between obsessed and having your first ever true friend. I understand that it seems weird that she is all over jeongmin and all but please also try to understand her past. She did grew up without a father, and her mother was treating her like a ghost. She did not grow up with any guidance from her parents. So having a first ever friend was like a dream for her. Understand that life can be tough without parents guiding you and teaching you basic stuff about life.
