Bai Han Qi, Bai Luo Yin's father, accidentally throws Luo Yin's underwear on the drain. Luo Yin then informs his friend, Yang Meng, that his mother (Jiang Yuan) is re-marrying. Meanwhile, Gu Hai is conflicted on deciding to whether or not attend his dad's re-marriage ceremony and approaches his girlfriend, Jin Lu Lu, for advice.

You Qi receives a gift from his admirer, but mistook the gift was from Luo Yin. After school, Gu Hai secretly follows Luo Yin home. Han Qi accidentally washes one of the remaining 2 pairs of Luo Yin's underwear.

Gu Hai beats his physical teachers by doing more than a hundred pull-ups. Luo Yin plans his revenge against Gu Hai by sewing his school jacket shut, resulting being sent out by his math teacher for creating a ruckus.

Gu Hai gets two sleeping pills from the school's doctor and puts them into Luo Yin's water bottle. Unfortunately, the cold medicine Luo Yin took in the morning is expired and that combines with the sleeping pills knocks him out unconscious in class. The next day, some jealous brat from another class , Wu Fang, barges in the classroom and starts insulting Luo Yin's mom, calling her a prostitute. Enraged, Gu Hai knocks Wu Fang down and starts beating him up.

Gu Hai sends Bai Luo Yin home after he gets drunk from drinking too much. When Gu Hai returns home, he sees his dad and refuses his request to move back home with his stepbrother and stepmom. His dad gets furious and beats him. Later, Bai Luo Yin invites Gu Hai to go fishing.