As an employee of a study abroad company, Zhezi meets the street singer Shu Ye many times. They have an old friend they miss together: Lu Fei. Lu Fei is Zhezi's best friend and Shu Ye's sister. Five years ago, Fang Yu, who was about to marry Zhezi, suddenly told Zhezi that he had fallen in love with someone else, and then died in a train rear-end accident. But Zhezi discovered that Fang Yu fell in love with his trusted former friend. A month later, Lu Fei was found committing suicide at home.
It turns out that Lu Fei is the host of the underworld. He was murdered by Xuanlong Yu because he discovered the secrets of the Qianlong world. He used the illusion of taking sleeping pills to cover up his sudden death from a heart attack caused by Qianlong's intrusion into his consciousness. The sea dragons and night dragons of the ancient cosmic continent gradually evolved into the Qianlong family under the evolution of the cosmic environment. Qianlong lives in the human subconscious, and Qianlong has established a close relationship with humans. As the only daughter of the old Dragon King, Ming Ling reorganized the Hidden Dragon Realm after the Dragon King's tragic death. However, her personal bodyguard Xuan Long Yu had second thoughts, while Xue Long Yu fell into a coma and now she doesn't know where she is. Zhezi's lover Fang Yu and Zhezi's potential master Xue Longyu are permanently trapped in the "end of the world" dream created by Lu Fei's subconscious. With the help of killers Hongfu, Xiaoqi and Shuye, Zhezi, who had been married for five years and was pregnant, finally found her former lover and rescued the real young master of the Qianlong world - Xuelongyu.