"Dear Reasoner (1)": Shen Xisheng, 19 years old, is a genius young detective with perfect looks, perfect observation skills, and perfect reasoning ability. Yin Chenxia, 29 years old, is a popular novel writer with explosive otaku abilities, explosive aloofness, and detective abilities... Unfathomable. Genius boy Shen Xisheng has been a super fan of his half-brother Yin Chenxia since he was a child. In order to gain his brother Yin Chenxia's attention, Shen Xisheng became a slightly famous detective in Country M when he was in high school. In order to further prove his strength to his idol brother, he even returned to China to compete with his idol brother. After returning to China, mysteries and murders continued around them. A magician died suddenly during a performance, and a medical student took risks for personal gain... The brothers worked together to solve a series of cases and became a golden partner with a tacit understanding. But the devil still lurks in the depths of the darkness, laughing at the stupidity and greed of the world. At the same time, the past and secrets about Yin Chenxia also surfaced... "Dear Reasoner (2)": After returning to China, Shen Xisheng and his brother Yin Chenxia jointly solved a series of strange cases, and unexpectedly discovered that the clues in these cases all pointed to a mysterious criminal organization. But just as they were tracking down this mysterious organization, they were threatened by the other party. A song that triggers a murder upon hearing it, a golden magic ball that can control people's consciousness, and green-light "zombies" that appear inexplicably... They groped forward in the darkness, fought against the devil, and finally discovered that the leader behind this criminal organization was by their side!
