Female protagonist: Xia Ye suffers from congenital heart disease, and her heart source was taken away at a high price. The only way to survive is to transplant a "mechanical heart." The process of heart-changing was not smooth, and it could even be said to be full of ups and downs. Her desire to survive prompted her to chase the mechanical heart, and thus, she became bound to the four male protagonists in the process of "chasing the heart"...
Pei Yinuo: He was Xia Ye's childhood sweetheart. He left without saying goodbye seven years ago. When he came back, he was already a young and promising chief physician in the Department of Cardiology. He and his mentor's laboratory were invested by a big boss to study the "Mechanical Heart" project, and he was the main person in charge of this project. The long years are recalled, and the relationship between childhood sweetheart and bamboo horse seems to have gradually shaken the balance...
Twenty-one: He is an AI robot developed by teacher Pei Yinuoen during his lifetime. After his teacher passed away, Pei Yinuo spent a lot of money to buy back the robot and install a mechanical heart for him as a carrier for the mechanical heart project. In fact, twenty-one had the consciousness of awakening long before he came into contact with the heroine. Later, after restoring the factory settings, he matched Xia Ye as his master. Her interaction with him actually accelerated the process of his complete awakening...
Jiang Chen: He is the sole heir to Qixing Group and the initiator of the "Mechanical Heart Project", and invested in Pei Yinuo Laboratory. The heroine was originally his prey and the most important pawn in completing his plan, but he happened to fall in love with her at first sight. Therefore, "the hunter falls in love with the prey", and the more restrained the love, the more surging it becomes...
Yuan Qi: The AI investigator developed a spark of love for Xia Ye during the investigation of the 21st case...
