Zhao Haitang, who possesses the rare panda blood type, is the long-term blood donor for the sickly young girl Qin Feifei. To exchange for compensation, she and Qin Feifei's older brother, Qin Ge, established a transactional relationship where Qin Ge supports and cares for her while she regularly donates blood to save lives. After three years of getting along, Zhao Haitang appears arrogant and spoiled on the outside while lacking love on the inside; Qin Ge is cold, hard, and overbearing, yet develops true feelings amidst their breakups and reconciliations. The two are constantly locked in a tug-of-war driven by conflicts over blood donation, breakups, family backgrounds, and childbearing. Deeply entangled in the commercial and power struggles of Dongzhou—plagued by forced demolitions, shopping mall reconstruction, rivals' schemes, and betrayal by brothers—Qin Ge's dark past originating from the slums is also slowly exposed.