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Su Yu, whose family was wiped out when he was young, was rescued by a mysterious master and learned martial arts. When he first entered the world, he was a chivalrous and righteous man. He became famous for winning the martial arts competition. However, he was hated by the leader of the Shadow Alliance, Ye Wuhen, and was repeatedly assassinated. While on the run, Su Yu discovered the Shadow Alliance's conspiracy to dominate the world, so he united various sects to form the "Anti-Devil Alliance". In the end, he and Ye Wuhen launched a life-and-death battle in the valley, defeated his opponent with "Dragon Breaking the Sky", and successfully took revenge. He and his lover Liu Ruoli continued to act chivalrously and restore peace to the world.

Lin Yue, whose parents died young, became a private detective with his love for detective reasoning. While investigating the case of Li Ting being followed, she accidentally got involved in a serial murder case many years ago, and a huge criminal network was involved behind it. While investigating with their partners Shen Yi and Criminal Police Ya, they were repeatedly threatened and Fang Ya was even seriously injured. But with their wisdom and courage, they identified the murderer Xu Feng, successfully rescued Li Ting and exposed his crime. After the case was over, a mysterious letter heralded a new challenge, and Lin Yue and Shen Yi once again embarked on an unknown detective journey.