The seventy-year-old lady Mengjun Shen ( Yalei Gui ) gets tempered with the age growing. Gradually, except for the housekeeper Dahai Li ( Deshun Wang ), no one is willing to stay with her. After his daughter-in-law Qin Yang ( Yijuan Li ) fell ill and was admitted to the hospital due to too much pressure, Mengjun Shen was finally sent to a nursing home by his family. Amidst anger and grief, Mengjun Shen decided to leave his last appearance in the photo studio, but he did not expect it. And started a fantastic journey of rejuvenation.

In a sudden, the wrinkled Mengjun Shen turned into a twenty-year-old young girl Lijun Meng ( Zishan Yang ). Back to Twenty again, Mengjun Shen not only experienced the opportunities and vitality brought by youth but also experience the sour taste of love. However, just when she was immersed in the illusion of happiness and couldn’t extricate herself, an accident threw her at the crossroads of her life. Mengjun Shen had to make a choice to stay in twenty or back to seventy.