Eighteen-year-old Niu An wakes up one morning to discover that he has somehow become an 81-year-old man. He now owns a large farm and has a pair of ungrateful children who leave their elderly father living alone in the mountains, looking after the vast property. Finding his house completely empty and starving, Niu An has no choice but to start farming to make ends meet. He jokingly declares that 81 is the perfect age to hustle. When various animals unexpectedly show up at his doorstep, he even asks the agricultural bureau to take them away, but his request goes nowhere. With no other choice, he accepts his new reality and begins his journey of raising his little ones.