Luo Sufang (Lv Liping) is a cleaner in a Japanese-funded enterprise with a meager income. Because she divorced early, she had to raise her old mother and her son He Zhipeng (Sheng Chao) who was in high school alone, so she lived in poverty and was very careful with her budget. He Zhipeng had poor academic performance, and his only hobby was parkour. He also organized the City Monkey Parkour Club. This made her very anxious. As the college entrance examination approached, she was extremely angry when she learned from her class teacher that her son had committed such bad deeds as stealing papers and falling in love. Misfortunes never come alone. She was forced to be laid off because of her old age, and her ex-husband (Guo Tao) came to pester her again, hoping to get custody of her son. Under pressure, she felt that she had worked hard all these years for only one purpose - to make her son have a promising future in college. However, He Zhipeng put all his energy into the parkour sport he loved, and made money by coaching and shooting commercials. For this reason, the two quarreled, and He Zhipeng ran away from home in anger. In order to let her son take the college entrance examination, she did not hesitate to choose to deceive her son to submit...