In the city of R in Southeast Asia, amnesiac Yuan Bu is rescued by siblings Wu Ting and Liu Liu, who run a flower shop. As they bond, Yuan Bu's cheerful demeanor earns their trust, despite his hidden secrets. When Wu Ting's health worsens, Yuan Bu enters underground boxing to pay for her treatment, only to face the return of Fu Yi, a sinister biologist from his past, whose reappearance is no coincidence.