"Open the Gate KINGDOM! Hello, I'm Mujin!"
Ko Sung-ho (고성호), also known as Mujin, is a South Korean rapper and singer under GF Entertainment. He debuted in 2021 as the lead rapper of the boy group Kingdom. Within the group, he represented the kingdom of Cherry Blossom.
Mujin debuted as a member of KINGDOM on February 18, 2021, with History of Kingdom Pt.1 Arthur and the title track of "Excalibur".