가벼운 마음으로 연애를 시작한 진형은 예상과 다르게 흘러가는 상황에 혼란스럽다. 욱신, 욱신! 두근, 두근, 두근! 달콤하게 굴면 뭐 홀라당 넘어갈 줄 알아?! 어림도 없어! 착각하지 마! 설렘과 불안 속에서 더욱 깊어지는 마음! 달달매콤한 동거 생활!
In their second year, after returning to school, Song Woo-yoon meets a strangely charming assistant, Woo Jin-hyung, in the administration office. After confessing her feelings out of the blue, they start living together in a one-room apartment. But it turns out that Assistant Woo is a little... peculiar?! A cohabitation life that navigates between Assistant Woo's pretentious behavior and the fantasies and delusions of life and college!