Lin Yan, who was a police detective in Shanghai in his previous life, was brutally exterminated because he exposed the shady story of collusion between warlords and supernatural organizations. He was reborn three years ago in the Republic of China, armed with memories of the future and the mysterious "Heart-Calling System", determined to change his destiny. On the surface, he is still a handyman in the patrol room, but in fact, he is secretly planning. With his talent in solving cases and advanced cognition, he integrates modern medical knowledge into the medicinal diet to treat the people, and uses his identity to deal with warlords, supernatural beings and Jianghu forces. As the system continues to upgrade, he gradually uncovers the unsolved mysteries of his previous life, and begins a grassroots counterattack that rewrites the history of the Republic of China.
