Emma, an accountant, followed her mother's instructions and spent her days humble and focused on her work. When a friend invited her to a costume party, she met a charming man by chance and spent a night of passion with him, hiding her true face. When their dream came to an end, they tattooed one half of a heart on each other's body as a token of the night, in case they could see each other again. When Emma went to the company where she was sent as a researcher, she found that Jonah, the CEO, was that man! It's great to see him again, but the woman he loves is the wild woman of that night, and I can't tell him who I really am.