Seoha, a devoted secretary, has spent years silently nursing unrequited feelings for her superior, Dohyun. One night, overwhelmed by raw, instinctive desire, the two cross a line neither of them ever intended to breach. When Seoha suggests they forget it ever happened, Dohyun responds differently—remarking that he likes how “clean” things are—and begins finding excuses to see her again. Unable to refuse him, Seoha finds herself gradually drawn deeper into a relationship she never meant to enter. Then, the unexpected happens: Seoha becomes pregnant—something neither of them wanted. Resolute, she decides to raise the child on her own and prepares to disappear from Dohyun’s life. But before she can carry out her plan, Dohyun learns the truth…