Jang Seong-cheol and the victim of violent crime, Dogi, seek revenge on criminals under the name of the Rainbow Taxi Company.

Disguised as a customer, Dogi sneaks into a factory and plans to pull revenge against the criminals with his team members.

A new request comes in from a bullied child. Dogi and his members are arranged in his school as a teacher.

Dogi escapes from the trap with the help of his members. Bullying children take an advantage of Dogi and plans.

Cho Do-cheol plans a scheme to take revenge against Dogi and Mr. Jang. Mr. Jang senses it and threatens him.

Dogi enters into a company, U Data, where a client works at. Meanwhile, Cho Do-cheol succeeds to escape.