When Minho was only four years old, his parents sold him to a deranged doctor for a mere $1000. They said he was "too naughty," too troublesome to raise, and left without a glance back. The doctor took him to a hidden underground facility known as Chamber 209-a place where thirteen children, all between four and seven, were caged for illegal psychological experiments. There, Minho was stripped of his name and given a number instead: 122. For twenty-three long years, he remained confined, isolated from the world, his humanity slowly eroded by fear and silence. Now twenty-six, he struggles to speak in full sentences, his voice limited to small, broken words. Years of captivity taught him that silence meant safety, and speech could bring pain. Even free, his mind still echoes with the walls of Chamber 209.

When renowned neuroscientist Hyunjin returns to the small town of Gimpo under the weight of scandal and memory loss, he expects silence and seclusion. Instead, he finds Minho-a soft-spoken florist who once meant everything to him. The problem? Hyunjin doesn't remember. As Hyunjin tries to piece together the fragments of a childhood he's forgotten, Minho quietly carries the burden of a promise made long ago. Surrounded by the gentle chaos of close friends, shared dinners, and the scent of fresh blooms, the two begin to orbit one another again. But when the past is blurred and time has changed them both, can love still find its way home?