Six detectives with different personalities formed the "Mysterious Case Six" and were involved in incredible mysteries one after another in the busy and noisy city. In each case, team members use their respective expertise to fight wits, courage and humor. As the mystery continues to deepen, a more dangerous hidden line emerges, pointing to a mysterious organization that controls everything. In the final showdown, the team relied on faith and tacit understanding to uncover the ultimate truth of all mysteries. The story has ups and downs, the cases are closely related, the characters gradually grow, and ultimately achieve the sublimation of themselves and the team.