Main
Jo Byeong-kyu as So Mun
An 18-year-old high school student and the newest member of the Counters; part-time server at Eonni's Noodles. Physically disabled following a car accident that killed his parents seven years ago, he joins the Counters after being possessed by the Yung spirit Wi-gen due to his strong sense of justice, responsibility, and desire to protect those dear to him. He was frequently able to summon the Yung and was chosen in a healthy and not comatose state due to his piled-up anger and frustration, that might as well destroy every evil spirit. As a Counter, he possesses superhuman speed, short-range psychometry and the ability to sense evil spirits that enter Yung's "Territory" (but in a range minor to that of Ha-na's). He later acquires psychokinesis and the ability to touch and summon the Territory at will. Mun has a strong talent for drawing and is currently illustrating a superhero webtoon alongside his best friends Woong-min and Joo-yeon.
Yoo Jun-sang as Ga Mo-tak
The assistant cook at Eonni's Noodles. A former detective of Jungjin Police Station, after a near-fatal fall that caused his memory loss seven years ago, he joined the Counters after being possessed by Gi-ran, granting him superhuman strength and short-range psychometry. Mo-tak is notable for his gruff appearance but can be a joker occasionally. He was somewhat like a mentor to Mun after he got to know about his past and relationship with Mun. In Season 2, he returned to being a detective at Jungjin Police Station, thereby being able to provide easier cover for capturing evil spirits.
Kim Se-jeong as Do Ha-na
The server at Eonni's Noodles. The sole survivor after she and her family were poisoned, Ha-na joined the Counters after being possessed by Woo-Sik who granted her superhuman strength and psychometry. She is capable of sensing evil spirits even from hundreds of kilometers away, as well as being able to read and enter memories from years ago as if she was physically there.
Yeom Hye-ran as Chu Mae-ok
The chef at Eonni's Noodles. In the past, she ran a photography studio for a living. Now a grieving mother dealing with the death of her son Su-ho. She joins the Counters after being possessed by Su-ho's spirit. She gains powerful healing abilities. Exuding an extremely caring and positive personality that highly contrasts with Mo-tak and Ha-na, she serves as the team's advisor and a mother figure to Mun.
Ahn Suk-hwan as Choi Jang-mul
The first and the leader of the Counters in Korea; owner of Jangmul Retail. Jang-mul is one of the richest chaebol in South Korea. He manages the Counters' expenses and supports them in matters that need his influence. He retired from being a Counter, though his powers and responsibilities as a Counter remain.
Yoo In-soo as Na Jeok-bong (Season 2)
A clumsy new Counter who is unfamiliar with everything. He became a new counter on the recommendation of Mo-tak, who was moved by the spirit of sacrifice. He possesses the ability to sniff the scents of evil spirits.
Lee Hong-nae as Ji Chung-sin (Season 1 (All Episodes) & Season 2 (Ep. 1, 9))
A human possessed by a Level 3 evil spirit (akgwi). Chung-sin works in a junkyard and is frequently hired as a hitman by Mayor Shin through his adoptive father. His biological father ran the care home he was adopted from, yet both of his father figures were extremely abusive towards Chung-sin during childhood and provided very little affection to him growing up, instead honing him into a criminal servant for their own dirty deeds. He killed the late counter Cheol-joong in a fierce battle. He possesses an advanced level of psychokinesis which can effortlessly incapacitate individuals.
Ok Ja-yeon as Baek Hyang-hui (Season 1)
A human possessed by a Level 3 evil spirit. Hyang-hui is inclined to marrying rich men in order to murder them and steal their money. She has the power of psychometry and is able to communicate with the possessing evil spirit, as well as demonstrating superhuman strength. Naturally flirtatious, her charm often catches her victims off-guard leading to an easier murder.
Kang Ki-young as Hwang Pil-kwang (Season 2)
A third-level evil spirit possessing powerful psychokinesis that can absorb the Counters' abilities.
Kim Hieora as Gelli Choi (Season 2)
A third-level evil spirit specializing in speed who scratches, stabs, cuts, and kills. She can also read and erase memories.
Kim Hyun-wook as Wong Li Qiang (Season 2)
A bright psychopath with a creepy smile. After he kills a Chinese Counter and gains healing powers, Wong returns to Korea and begins killing people more brutally and harshly.
Jin Seon-kyu as Ma Joo-seok (Season 2)
A benefactor of So Mun and a hot-blooded firefighter who does not know how to ignore injustice.
