Young-jae as Doctor (ep 1, 2) Jeon Ji-ahn as Kim Hye-sun (ep 2) Oh Hee-joon as Ghost hunter cameraman (ep 3) Moon Se-yoon as Ghost hunter cameraman (ep 3) Jung So-young as Choi Yeon-seo / Kang Mi-soo (ep 3) Kwon Min as Song Byung-chang (ep 3) Jang Eun-ah as Oh Hyun-jin (ep 3) Jo Jae-wan as Kim Jae-kwang (ep 3) Woo Jin-hee as Kang Je-yi (ep 4) Jo Deok-hyun as Vice principal (ep 4) Kim Na-hyun as Park Seul-gi (ep 4) Ji Su-min as Student (ep 4) Jeon Chang-gul as Fisherman (ep 6) Lee Sang-in as Lee Dong-mi (ep 6) Kang Sung-pil as Ghost (ep 6) Kang Sung-min as Choi Yong-joon (ep 6) Lee Jae-hee as young Yong-joon (EP 6) Kim Hee-ryung as Ahn Gil-ja, Yong-joon's mother (ep 6) Yeom Hye-ah as Jang Hye-ji (ep 7) Jo Yong-jin as Lee Byung-hoon (ep 7) Yang Eun-yong as Park Myung-hee (ep 7) Kang Suk-jung as Im Dong-chul (ep 7) Seo Ho-chul as Park Yoo-seok (ep 7) Heo Jung-kyu as Uhm Jin-won (ep 7) Park Woo-chun as Jo Byung-woo (ep 8) Kim Byung-chul as offender (ep 9) Song Tae-yoon as Kang Jae-sup (ep 9, season 2) Oh Min-suk as Han Tae (ep 10) Park Jung-hak as Moon Doo-hyun (ep 10) Kim Dong-wook as Lee Cheol-gyu (season 2, ep 1-2) Yeon Jung-hoon as police officer (season 2, ep 5) Lee Bit-na as Lee Ji-yeon (season 2, ep 8) Title origins The name "Cheo Yong" is inspired by a character in a folktale from the Silla dynasty; Cheo-yong discovers that his wife has committed infidelity with the god of smallpox, and he sings and dances until the god kneels before him in apology. Since then, people have attached an image of Cheo-yong to their gates to dispel evil spirits and invite auspicious energies. Original soundtrack Season 1 Season 2 References External links Cheo Yong season one official OCN website Cheo Yong season two official OCN website OCN television dramas 2014 South Korean television series debuts 2014 South Korean television series endings Ghosts in television Occult detective fiction South Korean crime television series South Korean thriller television series South Korean fantasy television series