Ilhoon (Jung Il Hoon)

                                             일훈    정일훈

Since 2012, Ilhoon has been continuously appearing on variety show Weekly Idol as a special MC/assistant MC together with Apink's Bomi. Ilhoon had his last broadcast in Weekly Idol on its 206th episode. In 2012, he collaborated with 4minute's Gayoon with the song "My Love By My Side" that was for My Love By My Side Musical. He also featured in Hyuna's "Unripe Apple" which was a track from Hyuna's second EP 'Melting'.

In 2013, he was featured in 2YOON's 'Harvest Moon' EP for the track "Nightmare" where he showed his impressive rapping skills. His featuring activities continued as he was later on revealed to be collaborating with G.NA for her title track "Oops!" of Beautiful Kisses EP.

In 2015, Cube Entertainment announced Hyuna's title track for A+ will be featuring BtoB's Ilhoon. The track was entitled "Roll Deep" (Because I'm The Best). He also participated in the making of the album. But he was only able to perform with Hyuna two times as there was a conflict with other BTOB schedules. He was replaced by Cube Entertainment's trainee, Kim Hyojong. Later in 2015, Ilhoon joined the line-up for Unpretty Rapstar 2's semi-finals episode as he performed with contestant Jiyoon for the track "This Ain't Me".

He also made his acting debut on 2015 with "Webtoon Hero: Tundra Show" as Kim Sungmin.

On May 24, 2017, it was revealed that Ilhoon will be releasing a self-composed track on May 30. On May 26, it was revealed that Ilhoon's solo song is titled "Fancy Shoes"

Ilhoon is set to make his first solo debut on March 8, 2018 with his mini album entitled "Big Wave"

On December 31, 2020 Cube Entertainment announced that Ilhoon would be leaving BTOB after the news of drug use was released to the public.