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Still affected by what happened to Su-ho, Si-eun withdraws from others. Seo Jun-tae contemplates taking a stand against the bullies — despite the risks.

After being saved by Si-eun, Jun-tae attempts to befriend him — but both are soon dragged into Choi Hyo-man's revenge plot involving Go Hyun-tak.

While doing volunteer work as punishment for fighting, Si-eun begins to form a bond with new friends — but trouble continues to find him.

After Geum Seong-je crosses the line, Si-eun strikes a deal with Na Baek-jin — leaving Park Hu-min, Hyun-tak and Jun-tae alone in the violent crosshairs.

Worried for his father and backed into a corner, Hu-min confronts Baek-jin. Si-eun considers studying abroad after clashing with his distressed mother.

Si-eun, Jun-tae, and Hyun-tak seek out Hu-min, who has decided to work with Baek-jin to keep the peace. Still, Hu-min finds it difficult to comply.

As Si-eun's absence leaves a gap, Baek-jin presses on with his violent mission. In response, Hu-min rallies his school and challenges him to a showdown.

Hu-min, Hyun-tak and Eunjang students gather to engage in a final confrontation against Baek-jin's gang. In the end, who will prevail?