2009–2010: Solo career Hoon originally debuted as a solo ballad singer under his real name and released an extended play
Pure & Love with the title track "Bus" on September 9, 2009. The following year, he released a digital single entitled "Beginning". Hoon also appeared in the SBS drama
Athena: Goddess of War (2010) as the president's bodyguard.
2011: U-KISS and acting career After the departure of Alexander and Kibum, NH Media announced that Hoon and Paran's AJ would be joining U-KISS. He made his debut as a member of U-KISS through the group's fifth mini album
Bran New Kiss which was released on March 30, 2011, with the title song "0330". Hoon along with bandmates Dongho, Kiseop and Soohyun began filming a movie with
Jay Park, Kim Soo Ro and
Park Yejin with the working title
Mr. Idol in February 2011. It was the group's first movie. Later that year, it was announced that Hoon and Dongho would star in Super Action TV's
Holy Land, a four-part movie about rebellious high school students. The movie first aired on April 28, 2012. In May 2013, Hoon was cast in the Korean musical
The Memory 2013 as Eunsoo, a role he shared with singer
Brian Joo. He and Kiseop were also cast for the leading roles of the musical
Goong, which was held in Osaka from July 11, 2013, to July 15, 2013.
U-KISS Unit with Soohyun In 2013, during the U-KISS album promotions of Collage, Hoon
performed with fellow member Soohyun on their unit song 'More Painful Than Pain'. In 2021, the unit group will release the song 'I Wish' in both Korean and Japanese.
2016: Japanese solo debut On January 16, 2017, it was announced that Hoon would make his Japanese solo debut with an album titled
Yukisakura, making him the third member of U-KISS to do so.
2021–present: New agency In August 2021, Hoon left NH Media after his contract expired. On January 24, 2022, Hoon signed an exclusive contract with Tango Music where he also returned with his groupmates Soohyun and Kiseop. ==Personal life==