Min Byung-Gyu was a retired hunter and one of the ten S-Rank and only S-Rank Healer of South Korea. He was a close friend with the White Tiger's Guild Master Baek Yoon-Ho. He took part in the fourth Jeju Island Reclamation Raid and was a member of the Korean Raid Team tasked with killing the boss of the Jeju Island Gate.

(Source: Solo Leveling Wiki, edited)