A male who usually wears hoodies. He is bold and fearless, often casually asking yokai or ghosts to be his friends or subordinates. In his past life, he was a powerful Chasa (Grim Reaper) and a general. He was righteous and had a younger brother who became a Reaper to help his older brother; that brother still watches over Hwansaeng's current reincarnation. As a Chasa, he was respected even by Great Yokai. While the spiritual power of Great Yokai does not affect him, physical attacks do. In times of danger, he can say "Heukdo" to summon a sword from the sky. A Chasa resides within that Black Blade, and no other yokai can possess it. It is a sword only Hwansaeng can use. He treasures his friends. He calls the comb-patterned pottery goblin "Bit-tokki" and can summon him by flicking a lighter or saying, "Bit-tokki, bring the club." He speaks informally, addressing everyone as "hey" or by their names like close friends. He has a playful, lighthearted, and reckless personality, but he becomes serious if a friend is hurt. He lost his parents long ago and lives independently.

His true form is a piece of comb-patterned pottery. He is a Great Goblin who has lived for 3,000 years, possessing immense spiritual power and strength. He can do anything with his goblin club, though Hwansaeng often takes it from him. He is male. He knew the Chasa, Hwansaeng's past life. Because of a promise to the Chasa to protect the Hwan family, he obeys Hwansaeng and considers him a close friend. His eyes glow purple, and he will perish if his true form, the pottery, is destroyed. He speaks informally, calling the Imugi "snake-head," the Gumiho "fox brat" or just "fox," and Hwansaeng "Mr. Kim." He considers the Imugi and Gumiho to be close friends as well. He looks like an ordinary man but has black horns. He is quick-tempered and often speaks in an annoyed tone. He uses a commanding style of speech ending in ~gun or ~da, but uses foul language. He is frequently teased. He wears a grey linen kung fu shirt with traditional Chinese frog buttons and a stand collar, along with a headband. Small black horns are located near his frontal lobe. He is prideful but will help his friends when they are in danger against a strong opponent. He speaks politely to the Chasa, Hwansaeng's past life, as a sign of respect.

During the Baekje period, he trained for 900 years, only eating horses that fell into the river or wicked humans. However, rumors spread that he was an evil dragon that devoured people. The Chasa, Hwansaeng's past life, stepped in and spared him by cutting his neck instead of his heart. He still has the scar on his neck. He is male. Because the Chasa promised to be friends in the next life after cutting his neck, the Imugi calls Hwansaeng "Commander-in-Chief," though he does not use polite speech. He has a cross-shaped mark on his cheek and looks like an ordinary man. He calls the Gumiho "fox brat" or "Gumiho," and the goblin "dog bowl." He possesses loyalty and friendship so strong he gave up ascending to heaven to protect Saeng. His eyes glow green. He uses a serious tone ending in ~gun or ~da, never speaks lightly, and rarely smiles. He enjoys teasing the goblin. He is a tsundere. He wears a black turtleneck with a high neckline and draped details. He uses a black staff embedded with a Cintamani (wish-granting jewel) as a weapon. He speaks politely to the Chasa, Hwansaeng's past life, as a sign of respect.

He has lived for 3,000 years and met Bit-tokki when he was around 1,000 years old. He is a male nine-tailed fox. He is the master of Mount Yeongmyo, has a sly personality, and considers Hwansaeng, the Imugi, and Bit-tokki his friends. He has white hair but hides his tail and ears to look like an ordinary white-haired man. However, nine tails appear when he releases his spiritual power. His eyes glow yellow. He uses a wooden sword as a weapon but possesses incredible speed and spiritual energy. He carries the small wooden sword with him at all times (and nothing else). He is calm and cold-blooded in battle. He calls the goblin "rice bowl," the Imugi "Imugi," and Hwansaeng "Saeng." He uses informal, arrogant, and playful speech ending in ~ne or ~ji. He loves teasing the goblin. He wears a white Tai Chi/Kung Fu uniform with blue frog buttons and collar decorations; he leaves the buttons undone with a black short-sleeved shirt underneath. He wears white glasses. He speaks politely to the Chasa, Hwansaeng's past life, as a sign of respect.

He is male. He is a Taoist master living in Peach Blossom Spring. He was fully qualified to be the head of the temple but handed the position over to Bihyeong. He speaks in a Jeju Island dialect and considers Hwansaeng a close friend, along with the other yokai by Hwansaeng's side. He calls Hwansaeng "Saeng" and addresses the others by their names. When addressing them all, he calls them "comrades." He never uses polite speech. He uses powerful Taoist magic and is playful and relaxed, though he has a serious side. He is quite a social butterfly among Taoists.