

Zhu Yun and Gao Jianhong feel threatened as people flock to Li Xun's coding camp, and they decide to challenge him to prove their programming skills.
After years abroad, Zhu Yun returns to her hometown filled with memories and old friends. Meanwhile, Li Xun tries to adapt to his post-prison life.
An unexpected reunion sends Zhu Yun on a trip down memory lane, where a defiant classmate becomes a major headache during her freshman year.

Zhu Yun confronts Li Xun about his absence from class. Soon after, a computer virus from Li Xun causes chaos in his department.