Male supporting character, Wen Li's ex-boyfriend from college. They dated for two years, and he left the country without explanation, causing a rational breakup initiated by Wen Li. He returns recently and confronts Wen Li at the dinner, expressing regret and claiming she is still his only love. Song Xingzhou is stubborn, refusing to accept her marriage, and believes doctors are compatible partners. His emotional outburst leads to Shen An punching him, revealing unresolved feelings and jealousy. Song Xingzhou represents the past that threatens Wen Li's present happiness. His character explores themes of closure, forgiveness, and moving on. Despite his affection, his past actions hurt Wen Li, making reconciliation difficult. His confrontation at the dinner serves as a climax that forces Shen An to publicly assert his marriage, strengthening their bond.
