Son Myeong-o’s sudden absence causes tension in the friend group. Dong-eun finds her trust in Kang Hyeon-nam tested.

With Park Yeon-jin’s wedding on the way, Dong-eun’s revenge rolls out according to plan. Meanwhile, a fateful encounter at a hospital takes place.

Tormented by her high school classmates and with nowhere to turn for help, Moon Dong-eun sinks into despair before deciding on a new mission in life.