Lin Xiaopei's "Heartbeat"
 This is the theme song of the romantic movie "Heartbeat" released in Hong Kong in 1999, which tells a story of a love triangle. Xiaorou and Chen Li are best friends. The shy boy He Jun falls in love with Xiaorou, and they both fall in love, but their affectionate love faces strong opposition from both parents, and this youthful love ends because of a misunderstanding. Many years later, He Jun and Chen Li, Xiaorou's best friend, get married. One day, Chen Li confesses to her husband He Jun that she is actually a lesbian, and they love the same girl - Xiaorou. He Jun meets his first love Xiaorou when he travels to Japan. Xiaorou knows that He Jun is married, so she gets engaged when she returns home. Ho Chun tried to rekindle his relationship with Xiao Rou. He flew to Hong Kong to tell Xiao Rou that he was divorced, but it was all in vain. Many years later, Chen Li passed away. Before she died, she left a message to Xiao Rou asking for her forgiveness. Xiao Rou then discovered that Ho Chun's wife was actually her best friend, Chen Li. When Xiao Rou was about to fly back to Hong Kong from Japan, she received a gift from Ho Chun. She opened the box and saw that it was full of photos. Those were photos of Ho Chun thinking about Xiao Rou and the short happy time they had together.
 Music can be referenced: Click me