Street doctor Shen Yehan discovers that all terminally ill patients have an encrypted code hidden in their bodies - the city's health detection system, which specifically marks "medical burden" and issues hunting rewards. He relied on his ancestral acupuncture method to treat diseases illegally but was hunted down. Until one day, a girl who called herself a code police came to his door. With just one sentence, a blood-red medical number appeared on the back of his hand.
