曾经的拳王陈唤十年前被迫退役，自此一蹶不振，负债累累，在拳馆浑浑噩噩地当着教练。二十出头的阿超喜欢格斗，从小在父亲的训练下学习摔跤，有着极佳的格斗天赋，但为了救同学余芯失手打死人而入狱三年. 出狱后，余芯带着阿超找到陈唤，希望陈唤能训练阿超。同时，陈唤得知女儿将被前妻送往加拿大念书，为了拿回抚养权，他需要经济基础，于是决定训练阿超参加格斗赛事以赢得奖金。在艰苦的训练和比赛中，两人积累了深厚的师徒感情，彼此打开心扉。
Chen Huan, a former boxing champion, was forced to retire ten years ago. Since then, he has been in a slump, burdened with heavy responsibilities, and drifting aimlessly as a coach at a boxing gym. A-Chao, in his early twenties, loves fighting. He learned wrestling from his father since childhood and possesses exceptional fighting talent. However, he accidentally killed someone while trying to save his classmate Yu Xin and was imprisoned for three years, leaving him with a deep-seated resentment. After his release, Yu Xin brings A-Chao to Chen Huan, hoping Chen Huan can train him. She knows that only fighting can awaken A-Chao, help him overcome his inner turmoil, and start a new life.
Meanwhile, Chen Huan learns that his daughter is going to be sent to study in Canada by his ex-wife. In order to regain custody and be with his daughter, Chen Huan needs to have a certain financial foundation. So Chen Huan decides to train A Chao and take him to participate in fighting competitions to win championships and prize money. Through arduous training and competitions, the two have developed a deep mentor-student relationship, and their closed hearts have opened a window to the world because of each other.
