Can You Take Care of Your Sister?

"My mother has no brother." "My uncle has no sister." "Then how did I get here?" Ding Xiaonai accidentally traveled back in time to a girl with the same name as him 20 years ago, but in the process of becoming good friends with her biological mother, father, uncle, and aunt, she discovered shocking secrets. The most shocking one was the boy who seemed to have known her for a long time...