Transmigrated into the 1960s Beijing of a historical drama, Cao Weiguo finds himself an orphaned martyr's descendant living in the notorious Siheyuan courtyard. Armed with a daily check-in system that provides essential supplies, he intends to live a low-key, comfortable life as a 'salted fish'—doing the bare minimum to get by. However, the courtyard is filled with manipulative neighbors, self-righteous elders, and parasitic families who view his solitude as an opportunity for exploitation.

When the matriarch of the notorious Jia family insults his deceased parents, Weiguo abandons his passive stance, delivering swift and brutal retribution. Now, as greedy neighbors scheme to extort his wages and guilt-trip him into funding their lifestyles, Weiguo must navigate a web of moral hypocrisy and social pressure. With his chef skills and system rewards, he turns the tables on those who seek to drain him, proving that in this crowded tenement, kindness is a weakness he can no longer afford.