The young man Qin Muhun transforms into an eighty-year-old man with terminal cancer, activates the "Justice Old Man" system, punishes evil and promotes good, and his life can be extended. He transformed into a "subway judge" and "bus hero", and successively exposed the false accusations made by Internet celebrities, subdued human traffickers, eliminated health care product fraud gangs, and punished unscrupulous fake doctors. During this period, he partnered with live broadcast blogger Jiang Miao to jointly expose social injustices. This move offended the criminal group headed by the scholar, and they met with crazy revenge. In the end, in order to save the kidnapped Jiang Miao, Qin Mu overdrafted his lifespan to unlock his ultimate power and broke through. However, he unexpectedly received the ultimate reward of the system and regained his youthful appearance at the age of twenty.
