Twenty-five-year-old Li Xuan meets Zuo Jingwen, who claims to be thirty, on a dating app. Li Xuan loves teasing him as an “old man,” but secretly finds himself drawn to Zuo Jingwen’s directness and good looks. The two hit it off over mahjong and video games. Li Xuan is proud, sharp-tongued, and loves to provoke; Zuo Jingwen is steady, doting, and indulgent. What starts as a joking suggestion to meet in person leads Zuo Jingwen to drive two hours to see him, his sincerity leaving Li Xuan flustered. At their first meeting, Li Xuan is thoroughly won over by Zuo Jingwen’s thoughtfulness and reliability, and is also surprised to discover his real age: a full ten years older. One night takes them past the boundaries of friendship, leaving their relationship in an uncertain, flirtatious haze. Introverted Li Xuan may still have a sharp tongue, but his heart has already fallen completely for Zuo Jingwen’s tenderness. What began as a chance encounter ends in love, and sharp-tongued, proud Li Xuan finds himself falling for an older man’s shamelessly devoted affection.