Lin Yang, 31 years old, is a woman who works well but is an empty nester, and is in a life without any waves. Lu Zhengan, 24 years old, a neighbor brother who grew up together, suddenly returned to China after completing his studies and broke into Lin Yang's world. The 24-hour all-round contact completely disrupted Lin Yang's life. Under Lu Zhengan's warm care, Lin Yang's psychological age "reverses growth" and turns back into a little girl. The two hold hands, fight monsters and pass levels together, and run towards happiness. From brother to boyfriend, from growing up together to growing old together, he grew up for her and learned responsibility and commitment, and she turned back into a little girl because of him and learned to show weakness and act like a spoiled child. Although life is bitter, fortunately, I have you as a candy.