Zhang Zhehan was a headstrong boy in high school with a prickly, gangster personality. Due to his many childhood scars, Hanhan keeps his heart closed towards other people. However, he changes after meeting his mentor Simon Gong who plays a key role in transforming her life from a "hopeless" delinquent to a compassionate doctor. They part ways due to a report of their close relationship, which was reported by a fellow student but subsequently meet again after 13 years, when Hanhan has become a successful doctor.