Everything starts on the birthday of Eun Jae's dad. Eun Jae ran into Park Moo Yul, who is the 2nd baseman of 'Green Dreamers', when she is drunk. Eun Jae who is a fan of 'Blue Seagulls', starts a fight with Moo Yul who led the 'Green Dreamers' to victory. The next day, internet is on fire with the video called 'Humiliated Park Moo Yul'. Because of this video, career of both Moo Yul and Eun Jae, who recently got a job as a bodyguard, are in danger.
In the end, they decided to put on a show against the public! They lie that Eun Jae is Moo Yul's private bodyguard and the video was recorded when Eun Jae was giving a self-defence demonstration to Moo Yul. Like this, Eun Jae becomes real bodyguard of Moo Yul. It seemed like everything worked out just fine, but the problem is that they can't stand each other's existence..
Kang Suk Ho is an ordinary lawyer who decides to take up a job at the nearby high school. After seeing the conditions of the school and the poor grades all the students have, Suk Ho decides to create a special class promising admission to the most prestigious college in Korea, "Chun-Ha-Dae University." Five of the most laziest students - Hwang Baek Hyun, Gil Pul Ip, Na Hyun Jung, Hong Chan Doo, and Oh Bong Goo join the class to in order to prove that they can do it with hard work and dedication.
Adapted from the manga "Dragon Zakura" (ドラゴン桜) by Mita Norifusa (三田 紀房).