- IU
- Â Jang Man-wol 16 episodes, 2019
- Yeo Jin-goo
- Â Goo Chan Seong 16 episodes, 2019
- Shin Jeong-geun
- Â Kim Seon Bi 16 episodes, 2019
- Bae Hae-sun
- Â Choi Seo Hee 16 episodes, 2019
- Pyo Ji-hoon
- Â Ji Hyun Joong 16 episodes, 2019
- Seo Yi-Sook
- Â Ma Go Shin 16 episodes, 2019
- Lee Do-hyun
- Â Go Chung Myung 15 episodes, 2019
- Cho Hyun-chul
- Â Sanchez 15 episodes, 2019
- Kang Mi-na
- Â Kim Yoo-na 14 episodes, 2019
- Lee Tae-sun
- Â Park Yeong-soo / ... 14 episodes, 2019
- Kang Hong-Seok
- Â Grim Reaper 14 episodes, 2019
- Park Yoo-na
- Â Lee Mi Ra 13 episodes, 2019
- Lee Da-wit
- Â Seol Ji Won 7 episodes, 2019
- Ahn Soo-bin
- Â Ghost Lee Do Yeon 6 episodes, 2019
- Seo Yi-soo
- Â Ji Hyun Mi 4 episodes, 2019
- Kim Esther
- Â [Yoo Na's classmate] 4 episodes, 2019
- Jung Dong-hwan
- Â Manager Noh 2 episodes, 2019
- Oh Ji-ho
- Â Goo Hyun Mo 2 episodes, 2019
- Kim Kang-hoon
- Â Goo Chan Sung [Young] 2 episodes, 2019
- Nam Da-reum
- Â Spirit of the Well (cameo) 2 episodes, 2019
- Lee Ji-wan
- Â Lee Eun-jin 2 episodes, 2019
- Kwon Hyuk-soo
- Â Doctor 2 episodes, 2019
- Kim Won-hae
- Â Mayor Park Gyu Ho (cameo) 1 episode, 2019
- Lee Yi-kyeong
- Â Yoo Oh 1 episode, 2019
- Park Jin-joo
- Â Gyung Ah (cameo) 1 episode, 2019
- Sulli Choi
- Â Jang Ji Eun (cameo) 1 episode, 2019
- Seo Eun-su
- Â Veronica (cameo) 1 episode, 2019
- Hwang Young-hee
- Â Hwang Mun Seok (cameo) 1 episode, 2019
- Kim Soo-hyun
- Â Hotel Blue Moon Owner (cameo) 1 episode, 2019
- Jo Hyun-sik
- Â Guest from room 404 (cameo) 1 episode, 2019
- Lee Joon-gi
- Â Exorcist 1 episode, 2019
- Cha Cheong-hwa
- Â Water Ghost (ep. 1) 1 episode, 2019
- Han Jae-yi
- Â Seo Joo Hee (Blind Ghost) 1 episode, 2019
- Lee Seung-joon
- Â Acupuncturist 1 episode, 2019
- Hong Kyung
- Â Baker 1 episode, 2019
- Yang Jo-ah
- Â Mi-ra's colleague 1 episode, 2019
- Hong Seo-jun
- Â Yoo Na's father 1 episode, 2019
- Lee Si-eon
- Â Astronaut 1 episode, 2019
- So Hee-jung
- Â Kang Man Young's wife 1 episode, 2019
- Cha Mi-kyung
- Â Bereaved Mother 1 episode, 2019
- Lee Hyun-kyun
- Â Dr. Han 1 episode, 2019
- Kang Suk-won
- Â Taxi Driver 1 episode, 2019
- Jang Hae-song
- Â Newlywed 1 episode, 2019
- Kwon Hyuk-hyun
- Â Kim Jeong-soo 1 episode, 2019
- Yang Hee-Won
- Â Ghost 1 episode, 2019
- Kim Jun-hyun
- Â Kim Jun Hyun 1 episode, 2019
- Kim Young-sun
- Â Yoo Na's mother 1 episode, 2019
