At Gu Chi's mother's funeral, Jiang Lan adopted Gu Chi, who no one was willing to take care of, in the name of "sister", becoming a ray of light in Gu Chi's dark life. Gu Chi also gradually fell in love with this beautiful "sister". Will the age gap hinder the development of their relationship? Faced with the confession of the "brother", how will the domineering "sister" respond?