In 2023, the 30-year-old male protagonist Chen Mo is an independent documentary director who is fascinated by the culture of the 1980s. Due to the huge pressure to choose a shooting topic, he found an old ring engraved with the word "" and an old cassette recorder while sorting out his grandmother's belongings. While auditioning late at night, the machine suddenly made an abnormal noise, and the bright light drew him into the turbulence of time and space.
