Kim Sung Joong, formerly known professionally as Gon, is a South Korean singer, dancer and former member of ARGON (아르곤).

He made his debut in March 2019 as the group's main vocalist with their first single album, "Master Key". Later that year, they launched their first Japan Live "Master Key" showcase in Tokyo, which kicked off a three-month Japanese promotional period for the album.

However, after releasing their first EP, the group saw a lack of promotion and activities and the agency, MSH Entertainment (MSH엔터테인먼트), also faced financial problems. While no official announcement was ever made, they quietly disbanded in early 2021.

He enlisted for his mandatory military service in January 20, 2021 and was discharged on May 23, 2022.

In 2023, he joined the show "Peak Time" as a solo artist and made the 1st cut and was grouped with 4 other singers that also auditioned on their own as "Team 24:00". They finished in 3rd place.

In 2024, he tried to enter the survival show "Project 7" but was eliminated in the preliminary round.

(Source: MyDramaList) Edit Biography