As a top programmer, Cheng Xu's life creed is: everything can be quantified and everything can be programmed. He wrote a strict operating system for his life - counting calories when eating, planning optimal routes for travel, and even daily mood swings were recorded in an attempt to find bugs. Friends say that he lives like a robot, but Cheng Xu disagrees: This is called efficiency, this is called stability. Until an illustrator named Xia Wan moved next door to him. Xia Wan's life is a series of "Fatal Errors" in Cheng Xu's system. She would suddenly have an idea at three o'clock in the middle of the night and play a symphony on the stereo; she would rub paint on the white wall of the corridor and name it "Encounter"; she would even cry with joy because a small flower bloomed on her cactus. For the first time, Cheng Xu's system encountered an exception that could not be handled. Cheng Xu tried to use logic to "optimize" Xia Wan. He formulated a "Healthy Work and Rest Management Plan" for her, and she used it as a drawing board. He helped her analyze "The Optimal Solution to Interpersonal Communication", but she complained, "Aren't you tired of living like this?" He warned her: "Your life is full of redundancy and randomness, which will cause the system to collapse." Xia Wan smiled and handed him a cookie that had just been baked and had a slightly failed shape: "But redundant machines are sometimes called surprises and romance." When the company's important projects reached a deadlock and everyone was helpless, it was an irregular curve in Xia Wan's graffiti that gave Cheng Xu subversive inspiration. When Cheng Xu fell into an emotional loop due to the shadow of childhood and was unable to "debug",
