Zhao Xiaolong, a rebellious and overweight wealthy youth, is sent by his father to the mountain Fire Phoenix Base. Under the iron-fisted training of instructor Lu Cheng, he undergoes arduous trials such as carrying water, chopping firewood, and running through the mountains, transforming from an 180-jin chubby teen into a lean, strong young man. Over five months, he kicks his internet addiction, learns responsibility, repairs his relationship with his father, and completes a spiritual reshaping through storm disaster rescue and assisting a forest ranger. After graduation, he returns to school, scores a full score on his physical fitness test, turns his grades around, and is eventually admitted to university. Lu Cheng proves his own backbone and capability with strictness and love.