Orange was born into the Seck family, which has guarded Hamel, the capital of the Kingdom of Senas for generations. In order to protect Hamel, he learned to fight since childhood. His father was a hero known as the "White Titan of Hamel".
When the demons invaded the Kingdom of Senas, he and his father tried their best to stop the demons. His father was controlled by the demons because he was under an evil spell and turned against him. He was unable to resist and was seriously injured in the battle, but was rescued from the battlefield by Elsword and his party.
During the period of convalescence, most of the area in Senas was occupied by demons. He judged that there was little chance of winning against the demons in Hamel. In order to protect Hamel and the "Water El Shard" and to recover his father from the demons, he must temporarily hand over the safety of Hamel to the Red Knights. In order to become stronger, follow Elsword and his friends on an adventure. He decided not to use his family's name until he became stronger, calling himself 'Orange'.
Cheng Cheng has been more sensible than his peers since he was a child and is not good at expressing emotions. He is a well-behaved child, but he is often misunderstood because of his sharp and strong fighting skills. When the demons invaded, he saw the people around him being killed by the demons, which gave rise to his belief in himself: "I will never let innocent people get hurt in front of me again."