Yujin has a hopeless crush on his cool and handsome sunbae, Choi Beom. But thanks to Yujin's shy personality, he can't even make eye contact with Beom and even pulls all-nighters because of the questionably sexy dreams he has about them. One day, Yujin accidentally gets trapped in his grandpa’s invention, a machine designed to unlock human potential. Due to a malfunction, Yujin splits into two personas: a nervous nerd and a shameless flirt. Now it's nerd versus flirt in a chaotic battle for Beom’s heart!