Official website: https://programs.sbs.co.kr/drama/connection/
Ji Sung
Jang Jae-gyeong
Jeon Mi-do
Oh Yoon-jin
Lee Hyeon-so
Park Joon-Seo (teen)
Kwon Yul
Park Tae-jin
Kim Kyung-nam
Won Jong-soo
Lee Sang-jun
Kim U-sung
Jung Yoo-min
Choi Ji-yeon
Jung Soon-won
Heo Joo-song
Yoon Na-moo
Park Jun-seo
Seo Yi-ra
Oh Soo-hyun