Arthur

On January 5, 2017, Arthur (then known as Yunho) debuted as a member of VARSITY with the release of the single "Round One". On April 17, 2020, Arthur was revealed as the next member fourth member of KINGDOM. A few days later, on April 23, VARSITY disbanded following the release of their farewell digital single called "We'll Meet Again".

On February 18, 2021, Arthur made his debut as a member of The KingDom (formerly known as KINGDOM) with the release of their debut mini album History of Kingdom : PartⅠ. Arthur. On January 20, 2025, GF Entertainment announced Arthur, along with Ivan, would be appearing on an overseas program.