In the fictional city "Lanhai City" on the southern coast, social terrorism programmer Lin Mo accidentally discovered the old diary left by his grandfather, which contained clues to an unsolved "watch shop theft case" thirty years ago, and this case seemed to be related to his grandfather's "unexpected death." In order to find out the truth, Lin Mo had to step out of his comfort zone, but while searching for clues, he met Su Xiao, a passionate policewoman who had just been transferred to the city bureau's serious crime team. One is so afraid of social interaction that he has to do half-an-hour psychological preparation when going out. Even when ordering takeout, he has to note "leave it at the door and don't make a phone call"; the other is very enthusiastic and rushes to the forefront of investigating cases, believing that "the truth waits for no one, and hesitation will lead to defeat." The two were forced to bind because of this old case. From the beginning, "social fear meets social bully, no matter who looks at it, it will be a big headache for everyone." Later, during the investigation, it was discovered that there was a more complicated chain of interests involved behind the old case, and some people even wanted to cover up the truth and attack them. Lin Mo uses his "code brain" to sort out clues and solve digital puzzles, while Su Xiao relies on years of experience in handling cases to track down connections and eliminate interference. In the "thrilling and funny" cooperation, the two not only get closer to the truth, but also quietly change each other - Lin Mo gradually overcomes social fear, Su Xiao learns to think calmly, and love quietly sprouts in the gap between "investigating cases is bigger than the sky".
