Prince Seiker

Chung was born into the Seiker Family that protects Hamel, the capital of Senace. Known widely as Prince Seiker, he was trained in combat ever since he was young. When Hamel was under attack by demons, his father was devoted to holding off the attacks. Unfortunately, the demon possessed his father, who then unwittingly led the enemies to attack Hamel. Chung tried to hold off his father, but he got seriously wounded by him.

Elsword and his friends helped Chung escape the battlefield so he could recover from his wounds. While he recuperated, most parts of Senace became occupied by demons. He then decided to leave Hamel in the hands of the Red Knights and go with Elsword to train and become stronger than ever. Prince Seiker then swore that he will not use the Seiker name and will call himself Chung until he returns to save Hamel and take the Water El back from the demons.

(Source: Elwiki)