Main •
Jung Woo as Jegal Gil, a mental healthcare coach and a former national Taekwondo athlete who quits sports due to an unprecedented scandal.
Supporting •
Yoon Joo-sang as Jegal Han-ryang •
Gil Hae-yeon as Shim Bok-ja • Cha Soon-bae as Dr. Song Ji-man •
Moon Sung-keun as Park Seung-tae • Lee Jin-yi as Choi Su-ji •
Kang Young-seok as Go Young-to • Jung Kang-hee as Oh Bok-tae • Park Han-sol as Oh Seon-ah •
Kim Si-eun as Jo Ji-young • Kim Si-eun as Han Yeo-woon •
Noh Ah-reum as Mo Ah-reum •
Hong Hwa-yeon as Kim Moo-young • Kim Yoo-jung as Park Ji-soo • Lee Chul-min as Park Sang-do
Extended • Choi Hee-jin as Choi Yeo-jeong • Yoo Young-jae as a coach • Lee So-hee as Oh Yeon-ji • Cha Seon-hyung as Park Seung-min • Park Jong-hwi as Oh Jin-tae • Lee Seung-min ==Viewership==