Chen Jiafu (Takeshi Kaneshiro) is a piano tuner. He is a bit dull and lives a repetitive life every day. One day, he met a nomad (Aaron Kwok). The nomad's life is homeless, either picking up girls or betting on horses. The kind-hearted Chen Jiafu took him in. One day, a girl named Mo Min'er (Kelly Chen) who likes to play Bach's Love Concerto moved upstairs. Chen Jiafu fell in love with her at first sight, but he could never express his affection for her. Soon, Mo Min'er was taken by the nomad first, and the two became a couple. In the end, Chen Jiafu told a story of "XO Chivalrous Couple". It turns out that everyone in the world is looking for his Mo Min'er. The lucky ones find her, and the unlucky ones can't find her in their entire lives. Love is like this.