known older brother

Kang Ho-dong

Fix MC

Lee Soo-geun

Core Team

Kim Young-jong

Core Team

Kim Hee-chul

Regular cast members of "Knowing Bros"

Lee Jun-ho

Guest Appearance

Kim Mi-hyun

Guest Appearance

Yeji

Guest Appearance

Qian 84

Guest Appearance

Kim Gyu-jong

Guest Appearance

Oh Ha-youn

Guest Appearance

Choi Soobin

Guest Appearance

Zhang Hao

Guest Appearance

Kim Ji-yeon

Guest Appearance

Jung-jae Cho

Guest Appearance

Ruka

Guest Appearance

Ahyeon

Guest Appearance

Shin Ryu-jin

Guest Appearance

Lee Eun-ji

Guest Appearance

Park Won-bin

Guest Appearance

Lee Yong-ji

Guest Appearance

Yun-ha Lu

Guest Appearance

Cheng Hanbin

Guest Appearance

Kim Jong-kook

Guest appearance by a familiar older brother

IU

Guest appearance by a familiar older brother

Lee Kwang-soo

Guest appearance by a familiar older brother

Daniel Kang

Guest appearance by an older brother figure (during Wanna One era)

Park Ji-hoon

Guest appearance by an older brother figure (during Wanna One era)

Yong Seung-woo

Guest appearance by an older brother figure (during Wanna One era)

Hwang Min-hyun

Guest appearance by an older brother figure (during Wanna One era)

Li Dahui

Guest appearance by an older brother figure (during Wanna One era)

Choi Yoo-jin

Guest appearance by a brother you know (during Kep1er)

Kim Chaehyun

Guest appearance by a brother you know (during Kep1er)

Stone Horse

Guest appearance by an older brother figure (during ZEROBASEONE era)

Lee Heeseung

Guest appearance (during ENHYPEN era)

Jungwon

Guest appearance (during ENHYPEN era)

Eunha

Guest appearance by a brother you know (during IZ*ONE era)

Choi Yena

Guest appearance by a brother you know (during IZ*ONE era)