Heavenly Echo

Shen Yan has always believed that any fault can be located through data, and any loss of control is just because the model is not complete enough. As an automation control engineer for a robotics start-up company in Lindai City, when his projects continued to fail and the company was on the verge of crisis, he went to Dongdai Mountain alone to relax, but accidentally fell into a barrier and entered a fairy cave forgotten by time. One year inside the cave, one day outside. Shen Yan practiced in the cave for seven years, entered the early stage of foundation building, and came into contact with an ancient self-calculating immortal weapon called "Xuanshu". Xuan Shu did not give him invincible power, only a series of cold error codes and a seal that was gradually failing. When Shen Yan returned to reality, only seven days had passed. The company's core robotics project is on the verge of failure, and competitors have stolen key results. He had to hide his cultivation into ordinary life and use control algorithms, sensors and low-level spells to repair the out-of-control system bit by bit. At the same time, he began to explore the rules of the cave through records and trial and error: every forty-nine outside days, the entrance to Dongdai Mountain would reappear with a new formation. Every time he enters, Xuan Shu will give new puzzles, and the existence deep in the seal is slowly awakening. In the workplace, he and product leader Lin Zhiwei went from questioning each other to fighting side by side; in the cave, he had to face a problem that engineers are least good at - how should people make choices when the world cannot be completely calculated? When the final demonstration of the robot project arrives at the same time as the next window to enter the cave, Shen Yan must decide: stay in reality and hold on to his hard-won life, or enter the awakening cave again.