Nineteen-year-old Zhou Yaozu comes from a wealthy family. Weighing 200 jin (100 kg), he spends his days obsessed with video games, eating, and avoiding work, while showing little respect for others. Unable to discipline him any longer, his father, Zhou Guoping, forcibly sends him deep into the mountains to be toughened up by Old Wang, a sharp-tongued but kind-hearted old man. Upon arriving, Zhou Yaozu resists at every turn, complaining about the harsh living conditions and refusing to do farm chores such as carrying water, chopping firewood, and hoeing the fields. He repeatedly throws tantrums and acts stubbornly. Under Old Wang's strict yet well-meaning guidance, and after befriending a mountain boy named Wang Xiaoshan, Zhou Yaozu is forced to work hard and endure hardships. Gradually, he comes to understand how difficult life can be, begins transforming himself, sheds his bad habits, and embarks on a journey toward weight loss and independence.