Inside Kim Yu Mi’s head, a tiny civilization is fighting for survival. Her Love Cell lies comatose after a devastating breakup. Her Rational Cell runs damage control. Her Hunger Cell just wants ramen. Together, they manage the chaotic operating system of an ordinary 30-something office worker trying to move on.
Then Koo Ung stumbles into her life—a game developer who builds worlds but can’t express his own emotions. His awkward sincerity jolts Yu Mi’s dormant Love Cell awake. Suddenly, her neural headquarters erupts: Logic demands caution. Romance scripts grand gestures. Anxiety floods the control room with worst-case scenarios. Meanwhile, inside Koo Ung’s own cell village, a rookie Love Cell panics at every text message.
As dates unfold and misunderstandings multiply, both cell communities must learn to cooperate. But when old wounds resurface, Yu Mi faces an impossible question: is she protecting her heart—or imprisoning it? Funny, heartbreaking, and wildly inventive, Yumi’s Cells proves that sometimes the greatest love story happens in the space between two brain cells.
