Ye-eun has a secret she can't tell anyone. She's deeply self-conscious about having severely inverted nipples and swears to never show her chest to anyone. But during a company workshop, she ends up having a one-night stand with Jaemin -a kind, capable colleaue- and accidentally reveals the complex she's kept hidden all her life. "I'll help you fix that complex, Ye-eun. And if we get to know each other better in the process, even better." Moved by Jaemin's offer to help her with her inverted nipples, Ye-eun accepts his proposal, and the two end up becoming sex partners...