VR game designer Ling Jiushi decided to resign when his job was not going well. A beta game made him forget about his worries. He unexpectedly received a game CD from abroad. After a car accident, he came to a corridor with 12 iron doors. When he came to the door, a mysterious man helped him escape from the wolf's claws in the forest and snowy mountains, and welcomed him to the world of the door. The door is extremely dangerous, and you will lose your life if you are not careful. Then, Ling Jiushi discovered something strange. If he was in danger inside the door and returned to the world outside, he would also encounter unexpected events.

The drama tells the story of Hao Nan, an "Unruly Teacher", and a group of students with very different personalities, who define their dreams and courageously pursue them together.