"You're my calm in the chaos, my certainty in uncertainty." Bang Chan is a workaholic software engineer, a brilliant but perpetually sleep-deprived, neglecting his well-being in favor of endless coding sessions. Despite his friends' attempts to set him up, Bang Chan prioritizes work, fueled by a difficult childhood and the recent loss. Meanwhile Choi Sun-Hee, a talented and passionate surgeon, dedicates herself to her patients despite a troubled past. Forced by her controlling father, the hospital owner, to abandon her writing dreams and become a doctor, Sun-Hee carries a heavy burden. Her father only cares about prestige and a family illness, manipulating Sun-Hee for his own gain. Fate intervenes when one of Chan's friend gets hospitalized, bringing Bang Chan and Sun-Hee face-to-face. As they get to know each other, they discover a shared yearning - Bang Chan for a life balance and Sun-Hee for a life of her own choosing. But their past traumas - Bang Chan's childhood struggles and Sun-Hee's fear - threaten to pull them apart. Will Bang Chan break his workaholic habits and find solace in Sun-Hee? Can Sun-Hee escape her fear's control and pursue her true passion?