Sorry I think this friendship was a toxic one from day one. Sang yeon was messed up from the beginning. To me she played people especially Eun jung boyfriend being all sly and manipulative, always playing the poor me card. They didn’t have a beautiful friendship at all and I would slap Sang yeon to the next world. Eun jung was a very good person too bad they didn’t give her more of a backbone in this drama. Haven’t finished all episodes yet but I’m hoping Eun jung kicks her to the curb.