In the 1990s in Daicheng, Lu Xiaolu (played by Dong Zijian) worked in a saccharin factory. He was a young man who didn't know where his future and life goals were. He followed a master named "Bull Demon King" (played by Shang Tielong) and didn't learn any skills. In the fitter class, he didn't know anything except tightening screws. In the electrician class, he could only change light bulbs. In addition, he liked to be late, fight, and climb over the factory wall, and he also made friends with a group of brothers. Until one day, Lu Xiaolu met a factory doctor named Bai Lan (played by Li Meng), and his life changed...