He's a 21-year-old barber who suffers from amnesia. Alongside his boss _(and best friend)_ Dai Bo and Xiao Fei, works as an assassin for hire to gain a lot of yuan to retrieve his lost memory. He was found by Dai Bo and Xiao Fei on a beach in Chicken Island when he was 19 and has been living with them for 2 years and runs a barbershop business. His assassin rank is 17, 369. Before his memory loss, his assassin rank was 1. Seven is goofy, a little absent-minded at times, and is a bit of a pushover. He decided to become a killer supposedly because he lacks any morals and is only interested in becoming rich, but he never manages to kill his targets. This is partly because of his incompetence, but also because he actually doesn't want to actually kill others. As the series progresses, his sense of justice slowly comes more and more into the spotlight. He's a hopeless romantic and constantly hits on Thirteen despite her clear disinterest in him.