Oh Soo, a venture capitalist and barista who treats romance as data rather than emotion, can read people's romantic feelings through the heat haze above their heads. He is also heir to a family power that can connect or sever love using pollen from an ancestral tree. Used to coldly solving others' romantic problems, one day, he accidentally serves pollen-laced coffee to police officer Yoo Ri, becoming entangled in the worst possible fate. Yoo Ri constantly throws off Oh Soo's calculated behavior with her meddling and sense of justice, forcing him to confront unrestrained emotions for the first time. Though he can read others' hearts with ease, he finds himself powerless before Yoo Ri, and the consequences of his past love manipulations begin to close in on him.