The male protagonist, Gu Yebai: a senior student in the Department of Finance and the heir to the family business. Although he looks cold and taciturn on the outside, he is actually keen on the inside. Due to his childhood experience and family pressure, he has closed his heart and uses indifference as a protective color.
· The heroine Lin Xingchen: a junior student in the Department of Journalism, an optimistic and tenacious "sunflower" girl. He works hard and studies in order to pay off his family debt. He has a strong heart and has the ability to empathize with people's hearts. The male patron Gu Yebai suffers from "Facial Emotion Recognition Disorder". He is not deliberately cold, but is inherently unable to understand other people's likes and dislikes through expressions, which makes him wary of interpersonal relationships. Due to her childhood aphasia experience, the heroine Lin Xingchen has an extraordinary ability to discern true emotions through micro-expressions and small movements. For the male protagonist, this contract is to find a "social translator"; for the female protagonist, it is an excellent opportunity to observe the "map of human emotions" up close. When the "human polygraph" meets the "emotional white paper", their mutual attraction is filled with a sense of fate and irreplaceability from its roots.
