He's a bad boy studying in a college only for rich where students council rules even though the other staffs exist. And to win the president's position of the council, Jimin accepts a bet kept by the current president, Mark in which he has to spend 3 months in another college disguising himself as a nerd and no one in the college should know his real identity. He's the son of the CEO of the biggest company in South Korea. He has successfully completes his bet and yesterday was the last day.