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On a night of heavy rain, a large-scale power outage occurred in Xijing City. Theoretical physicist Lin Zeyuan slipped and fell from the building while rescuing data at the institute, and his heart stopped beating; at the same time, retired race car driver and taxi driver Wang Dachuan died of brain death in a viaduct accident. One lost his body and the other lost his brain. In the early morning, an operation that had never been made public or allowed to exist was quietly completed in a closed operating room with only one person and an AI-assisted system running. After waking up, Lin Zeyuan found that he was living in Wang Dachuan's body. He has the legs of a normal person, but has lost his original life. He cannot return to his wife Shen Ning and son Lin Zhiyuan, and can only continue to live as "Wang Dachuan". But what Wang Dachuan left behind was a family on the verge of collapse: his silent and forbearing wife Chen Jing, his young daughter Wang Xiaoman, unpayable debts, and the scars left by his long life. In the process of relearning "how to be another person", Lin Zeyuan gradually fell from the world of looking up at the stars to the real and trivial human world. He began to drive a taxi, pick up his children from school, and buy hot milk at a late-night convenience store. For the first time, he understood the ordinary life that he had ignored. At the same time, Lin Zeyuan's former friend Zhou Xubai is slowly entering the family that originally belonged to him. "The Light in the Heart" is not a story about science fiction miracles, but a story about identity, responsibility and the light of the world. Some people spend their whole lives chasing the distance, only to discover in the end that what really makes people stay is never the starry sky, but the light that is always on for you.