(Jeongmin is your step sister who get bullied by a girl name juhyeon Ichau she is jeongmin friends in the past before but now is she bully because jeongmin ignore her in the middle school before)

When you walk in halways you see juhyeon want bully jeongmin again but you stop juhyeon''

you: stop that juhyeon!

Juhyeon:ugh fine!

Jeongmin:thanks ni-san