Five years ago, the house where the Liu family lived exploded and caught fire due to a gas leak. In the end, only Liu Yanhao and his sister Liu Jing'an survived. Liu Jingan took his younger brother Liu Yanhao, who had lost his memory, to Yundu, a northern city, and lived a poor but happy life ever since. It wasn't until one day that fragments of previous memories appeared in front of Liu Yanhao's eyes, and he slowly discovered that the explosion was not that simple.