Siyun is a well-built man with white hair and light blue eyes. He is always seen wearing casual or simple clothing. When he first became an idol, his hair was black. He then later dyed it to white. His birthday is February 15, 2000. He's cruel, manipulative, and mischievous. He's 5'11. He used to be a kind and cheerful person until Yoo Seunghyun bully him. He's flirty and also a psychopath. He won't hesitate to kills anyone who stand in his way. He's a lucid dreamer. He can travel through dreams