He is the only person who possesses the coveted Seven-Star knives. Although, on the episode "The True Owner of the Seven-Star Knives", he encounters an Underground female chef, Shan An, who possesses duplicates.
There is only one person who owns the extremely valuable Seven-Star knives. In the episode "The True Owner of the Seven-Star Knives", he meets a female chef from the underground, Shan An, who also possesses identical knives.