Main •
Kim Hee-sun as Koo Ryeon •
Kal So-won as young Koo Ryeon : A grim reaper and the leader of the crisis management team of Jumadeung. Park Joong-Gil's wife in her past life. •
Rowoon as Choi Joon-woong • Kim Ra-on as young Choi Joon-woong : A young job seeker and new contract employee of Jumadeung. •
Lee Soo-hyuk as Park Joong-gil •
Park Sang-hoon as young Park Joong-gil : The leader of the Grim Reaper management team who guides the dead in Jumadeung, and is a strict principled person. Koo Ryeon's husband in his previous life. •
Yoon Ji-on as Lim Ryeong-gu • Seo Yoon-hyuk as young Lim Ryeong-gu : The assistant manager of the crisis management team of Jumadeung. •
Kim Hae-sook as The Jade Emperor : The director at Jumadeung, the underworld monopoly.
Supporting People related to Jumadeung • Moon Seo-yoon as Jeon Su-in : A member of the Grim Reaper management team of Jumadeung. • Kim Nu-ri as Jang Jae-hee : A member of the Grim Reaper management team of Jumadeung.
People around Choi Joon-woong •
Yoon Yoo-sun as Jeong-im, Choi Joon-woong's mother • Kim Seo-yeon as Choi Min-yeong, Joon-woong's younger sister. •
Kwon Hyuk as Joon Woong's father
Extended ; Noh Eun-bi's incident (Ep. 1–2) • Jo In as Noh Eun-bi : A workaholic television playwright who is a victim of school violence. • Kim Chae-eun as Kim Hye-won : A popular webtoon writer who is the perpetrator of school violence. • Jung Yun-sol as Kwon Dan-ah, Noh Eun-bi's friend. • Seo Young-bin as a producer of TV station where Noh Eun-bi works. • Jang Ji-eun as a friend of Kim Hye-won. • Sun Arin as a friend of Kim Hye-won. ; Namgoong Jae-su's incident (Ep. 3–4) • Ryu Sung-rok as Namgoong Jae-su, Joon-woong's close friend. • Kim Ji-hoon as young Namgoong Jae-su • Kim Kyung-min as Namgoong Hyun, Namgoong Jae-su's father • Im Sae-byeok as Namgoong Jae-su's mother • Kwak Ja-hyung as Kim Woong-jun, Joon-woong's another face. ; Kang Woo-jin's incident (Ep. 4–5) •
Kang Seung-yoon as Kang Woo-jin, a singer-songwriter • Shin Seo-woo as young Kang Woo-jin • Lee No-ah as Heo Na-young : Kang Woo-jin's wife who died in an accident. • Min Eung-Sik as Heo Na-young's father • Kang Joo-Hee as Heo Na-young's mother ; Lee Young-cheon's incident (Ep. 6) •
Jeon Moo-song as Lee Young-cheon, former Korean War Veteran. • Lee Jung-jun as young Lee Young-cheon • Jung Chung-gu as owner of the junkyard • Lee Kyu-Seop as a gangster • Kim Jeong-cheol as Kim Dong-shil, Lee Young-cheon's fellow soldier in the battlefield ; Shin Ye-na's incident (Ep. 7) • Han Hae-in as Shin Ye-na, an employee at SP beauty marketing team • Kim Min-so as Jung Bo-ram, an employee at SP beauty marketing team • Kim Heung-rae as SP beauty marketing team leader • Jung Se-Hyun as Sunset • Shin Chi-Young as Goodbye ; Kim Kong's incident (Ep. 9) • Kim Kong, an old dog who doesn't have much time left and ran away from home •
Cha Hak-yeon as Kim Hoon, the owner of Kong • Lee Kyung-hoon as young Kim Hoon ; Twin siblings' incident (Ep. 10) • Gong Jae-hyun as Cha Yoon-jae, the twin brother of a sexual assault victim. • Lee Ji-won as Cha Yoon-hee, Yoon Jae's twin sister, the victim of sexual assault. • Kim Jun-kyung as Tak Nam-il, a medical student and the perpetrator of sexual assault. ; Lim Yu-hwa's incident (Ep. 11–12) • Min Ji-ah as Lim Yu-hwa • Jeon Eun-joo as young Lim Yu-hwa (last incarnation) : A woman who lost her newborn child. She was Lim Ryung-gu's mother in her previous life. •
Lee Ki-hyuk as Park Hae-il, Lim Yu-hwa's husband • Jung Soo-han as Kwon Sang-soo, an employee at Jumadeung's sales department ; Yoo Bok-hee's incident (Ep. 13) •
Kim Yong-rim as Yoo Bok-hee • Park Yoon-young as young Yoo Bok-hee : A woman who thinks her friend Yun-i became a
comfort woman due to her fault. • Park Hee-jeong as Jeon Bo-yun / Yun-i • Lee Seo-yeon as Yun-i : A newly employed Grim Reaper at management team of Jumadeung. She was Yun-i, Yoo Bok-hee's friend in her previous life. ;Koo Ryeon's past life (Ep. 14) • Koo Si-yeon as Gop-dan, Koo Ryeon's personal maid •
Kim Si-eun as young Gop-dan •
Jung Jae-eun as Koo Ryeon's mother-in-law • Kang Joo-eun as Ryu Cho-hui's younger sister • Shin Jun-chul as Ryu Cho-hui's father
Special appearances •
Jeong Jun-ha as Chief Jeong, Noh Eun-bi's favorite comedian (Ep. 1–2) • Bae Jeong-nam as a scammer (Ep. 1) •
Ryu Hye-rin as Scammer (Ep. 3) == Production ==