A Wealthy Family Finds Their Biological Son, but His Sister Dislikes Him and Pushes Him Downstairs, Blinding Him

A son who went missing for many years is found by a wealthy family, but his older sister dislikes him. During one of their fights, she pushes him down the stairs and blinds him. To keep him quiet, his wealthy parents leave him in a villa to fend for himself. The main storyline centers on the injured older sister, who is an assassin.