In his previous life, Lin Chen was tricked by his neighbors and died of cold and starvation due to his kindness. After his rebirth, he activated the "Fusion System of All Things", which can consume mental energy or points to fuse inanimate objects to generate new items. Relying on the meticulous logic of an engineer and the decisiveness of an avenger, he dealt with the "senior care group" composed of "moral god" Yi Zhonghai (calculating retirement care) and "grumpy dad" Liu Haizhong (distorted family) in the courtyard. He used the system to fight back to survive, and later lost his ruthlessness and started doing business. The story interweaves the marks of the times and the game of human nature, showing the protagonist's growth from revenge to "circle on the outside and square on the inside", as well as the complex ecology of the courtyard neighborhood.
