Main •
Lee Yu-bi as Woo Bo-young, a three-year physical therapist who wanted to become a poet. •
Lee Joon-hyuk as Ye Jae-wook, a physical therapy professor. •
Ahn Do-gyu as young Ye Jae-wook •
Jang Dong-yoon as Shin Min-ho, a physical therapy trainee.
Supporting Department of Physical Therapy •
Lee Chae-young as Kim Yoon-joo •
Seo Hyun-chul as Yang Myung-cheol •
Shin Jae-ha as Kim Nam-woo • as Park Shi-won • Jeon Hye-won as Choi Yoon-hee •
Park Han-sol as Lee Shi-eun
Department of Radiology •
Park Sun-ho as Han Joo-yong •
Defconn as Kim Dae-bang
Special appearances •
Lee Kan-hee as Min-ho's mother •
Kim Il-woo as Min-ho's father •
Lee Hee-jin as Je-wook's ex-girlfriend (Ep. 5, 8-9) •
Lee Hae-in as Park Yeon-hee, Dae-bang's ex-girlfriend (Ep. 5) •
Mo Tae-bum as Mo Tae-bum, a sports star (Ep. 6) •
Go Se-won as Yoon-joo's ex-husband (Ep. 7) •
Ha Seok-jin as Ha Seok-jin, a patient (Ep. 11) •
Park Cho-rong as Kim Mi-rae, a college student (Ep. 12) •
Kim Won-hae as Kim Jung-soo, a doctor (Ep. 13) ==Production==