A male who usually wears a hoodie. He is bold and unstoppable, even toward yokai or ghosts, often treating them as friends or demanding they become his subordinates. In his past life, he was a powerful Chasa (grim reaper) and general. He was righteous and had a younger brother who became a Reaper to help his older brother; that Reaper still protects Hwansaeng's reincarnations to this day. The Chasa was respected even by Great Yokai. Great Yokai's spiritual powers don't work on him, but physical attacks do. In times of danger, he can say "Heukdo" to make a sword fall from the sky. The Chasa resides within that Black Blade, and no other yokai can possess it. It is a sword only Hwansaeng can use. He cherishes his friends. He calls the comb-pattern pottery goblin "BitTokki" and can summon him by turning off a lighter or saying, "BitTokki, bring the club." He speaks informally, calling everyone "Hey" or by their names, treating them like buddies. He has a playful, non-serious, and reckless personality, but becomes serious if a friend is hurt. He lost his parents long ago and lives independently.

His true form is a comb-pattern pottery vessel. 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, but Hwansaeng often steals it from him. He is male. He knew Hwansaeng's past life as the Chasa. Due to a promise made to the Chasa to protect the Hwan family, he listens to Hwansaeng and considers him a close friend. His eyes glow purple, and he will vanish if his true body, the pottery vessel, is broken. 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 close friends as well. He looks like an ordinary man but has black horns. He is easily provoked and speaks in an annoyed tone. He uses commanding speech patterns but with rough language. He is often teased. He wears a gray linen kung fu shirt with traditional Chinese knot buttons and a stand collar, along with a headband. He has small black horns on his frontal lobe area. He is prideful, but will help his friends when they are in danger against a strong opponent. He uses polite language toward Hwansaeng's past self, the Chasa, as a sign of respect.

During the Baekje period, he trained for 900 years. He only ate horses that fell into the river or evil humans, but rumors spread that he was a wicked dragon that ate people. Hwansaeng's past life, the Chasa, stepped in and spared him by cutting his neck instead of his heart. He still has a scar on his neck from that time. He is male. Because the Chasa felt sorry after cutting his neck and suggested they be friends in the next life, the Imugi calls Hwansaeng "Commander-in-Chief," though he does not use polite speech. He has a cross-shaped pattern 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, having given up ascending to heaven to protect Hwansaeng. His eyes glow green. When serious, he uses a formal tone, never uses light speech, 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 rod embedded with a Cintamani (wish-fulfilling jewel) as a weapon. He uses polite language toward Hwansaeng's past self, the Chasa, as a sign of respect.

He has lived for 3,000 years and met BitTokki 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 BitTokki his friends. He has white hair but keeps his ears and tails hidden 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 power. He carries a small wooden sword with him at all times (and nothing else). He is calm and cold in battle. He calls the Goblin "Rice Bowl," the Imugi "Imugi," and Hwansaeng "Saeng." He doesn't use polite speech, instead using an arrogant, playful, and relaxed informal tone. He loves teasing the Goblin. He wears a white Taichi/Kung Fu martial arts uniform with blue knot buttons and collar trim, left unbuttoned with a black short-sleeved shirt underneath. He wears white glasses. He uses polite language toward Hwansaeng's past self, the Chasa, as a sign of respect.

He is male. He is a Taoist immortal 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. He considers Hwansaeng a close friend and also views the other yokai around Hwansaeng as close friends. He calls Hwansaeng "Saeng" and calls the others by their names. When addressing them all together, he calls them "Comrades." He never uses polite speech. He uses powerful Taoist magic and is playful and always relaxed, but has a serious side. He is quite the socialite among Taoists.