The story revolves around a series of carefully designed and interlocking mysteries. Private detective Cheng Qi accidentally got involved in the first bizarre case, met detective Song Ran and others, and formed a crime-solving team. Teamwork, coping with challenges with humor, and facing the escalating mystery, everyone grows and complements each other in the case. As the truth was gradually revealed, everyone discovered that there was a huge conspiracy hidden behind all the mysteries - Yu Lao's ultimate test. There are layers of reasoning, hilarious interactions, and unexpected twists and turns. At the moment when the final mystery is solved, the transformation of their hearts is also completed.
