"Open the Gate KINGDOM! Hello, I'm Chiwoo!"
Guk Seung-jun (국승준), better known as Chiwoo, is a South Korean singer under GF Entertainment. He is a former member of the boy group KINGDOM. He made his official debut in 2021 as a member of the boy group Kingdom. Within the group, he represents the Kingdom of Cloud.
On May 25, 2022 GF Entertainment announced that Chiwoo would be leaving the group due to personal circumstances.