The head and the master are one entity.

The leader of the Yongdong gang, Gui Touzhi, is rapidly rising in the underworld with his innate charisma. After taking over the Mingdong gang, he holds his first meeting with the organization's think tank. However, he feels very awkward as he knows nothing about the internet, email, or Nasdaq...

"Guys, I'm going back to school!"

Gui Touzhi's second-in-command, Shangdou, and 'the brain' sell two hotels from their territory to donate to a private high school, allowing the boss to enroll. On his first day of school, Gui Touzhi recalls his student days, using two coins to press his pants crease straight and neatly combing his hair; he is excited like a child. Gui Touzhi is determined to obtain his diploma, but reality presents countless 'obstacles' - confrontations with school bullies and the school authorities who want to fire his mentor. Life in school becomes unbearable for Gui Touzhi.

After some time, Gui Touzhi gradually adapts to school life, but another uneasy premonition comes over him. He begins to unknowingly like his deskmate, Yoon Ju. Her fresh face without makeup, her 'reckless' tone, and her casual punches towards him - actions no one dares to do outside - begin to attract his heart towards her. Shangdou visits the school to deliver lunch to Gui Touzhi and meets the beautiful teacher, Lee Jisun, falling in love at first sight. Shangdou, someone who acts immediately on what he likes, gently proposes a date to the female teacher: "Teacher Lee, since we've met, let me be your bodyguard. If anyone owes you money or..."

Gui Touzhi's dissatisfaction with the school finally erupts...

This school that always makes his beloved Yoon Ju sad, along with its tyranny... "Anyone who doesn't respect teachers will surely die if they're caught by me..." His 'struggle' against the school finally comes to an end!