Han Cheol, along with his gang, Geon Mo and Min Ho, tries to be the best in second grade. One by one, they beat out the talented second year students as if beating dojo masters. Han Cheol learns about a master, Jin Man, through a video. Without any idea what is going on, Min Su, wanting to practice finds a boxing ring where Jin Man also practices, and so begins to sleep with the two enemies. However, they need each other so they avoid their uncomfortable jealousies..