A member of the Imperial Knight Guard from Hamel, born in the Shark family, a pure knight with the best bloodline. Every knight of the Shark family is responsible for protecting the imperial family. They always stand at the forefront of the battlefield, fearless in their hearts, and hold weapons to destroy every enemy who deceives their mission. Facing the invasion of the demons and the patriarch being eroded by the darkness, Leng Yun and Cheng resolutely led the team to fight back but were defeated. In a desperate moment, they were accidentally assisted by Elsword and the Red Knights. Therefore, in order to save his father and Hamel, Cheng resolutely joined Elsword's ranks, while Leng Yun decided to find a way to repel the demons alone. Cheng's combat power comes from the Guardian Stone, which is similar to the El Stone, and constitutes the silver-white armor "Plateini" that can withstand all monsters. He holds the "Vulcan Cannon", a destructive weapon that represents justice and super destructiveness.