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. At school the next morning, Luo Yin got diarrhea from wearing wet underwear. After a few trips to the restroom, Luo Yin found a box of underwear & medicine in his bag. Luo Yin then suspect that someone must've followed him home. He got mad and demands to know who it was. Gu Hai then admit it was him and explained he had no special intention for doing so, saying he only wanted to take care of him (hence the gifts). Gu Hai then confessed to being the one who tore out Luo Yin's notebook, saying he did so because he admired his calligraphy and wanted to practice his using Luo Yin's as pattern. Luo Yin becomes mad and asked if he wanted a fight. Later, Gu Hai changes his seat and sat behind Luo Yin, there he starts cutting holes on Luo Yin's uniform. During the class' physical lesson, Gu Hai impresses both his classmates and teacher by doing great at exercise activities. (Source: IMDb)