@ysl I think that ra-im is jealous of the life su-ae has cause she doesn't have lovely parents, a home so she fulfill that desire of being loved by taking away what su-ae likes, those things are her boyfriend and friends. If you pay close attention you can see that she's no longer interest in minwoo when she found out su-ae doesn't like him anymore. The moral of the story is that ru-im needs to go to therapy 