My Eight-Year-Old Sister Became My Girlfriend

Lu Hao's mundane high school life shatters when a stunning blonde transfer student claims to be his girlfriend and fiancée. Behind her teenage facade lies an eight-year-old child with a mysterious connection to his past. As buried memories resurface on her birthday, Lu Hao must unravel the truth about their twisted relationship while his friends watch his world spiral into chaos. What secret binds them together, and why does she insist on this dangerous charade?