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Ryu (류, Lyu) is a minor, yet supporting character in the overall series. She is the mother of Kang-lim who taught him how to fight ghosts and she is a former member of the Guido Exorcist.
Biography[]
The Secret of the Ghost Ball[]
She appears in Kang-lim’s vision when he wakes up in Hari and Doori’s room. After he leaves Shinbi Apartment, she appears tied to a tree in her and Kang-lim’s house, meaning she still kept the Underground Nation bound in her body. Kang-lim swears to the Underground Nation that he will destroy him and free his mother’s body and soul.
In the episode, The Rise of the Underground Nation, Ryu is still tied to the tree, but Kang-lim gets his eighth and final ghost card and unlocks the gate to the Underground Nation’s prison, eventually freeing his mother. However, the Underground Nation wasn’t defeated, as Kang-lim and Ryu tried to fight off the Underground Nation but lost once more and he takes Ryu captive, saying that she possesses great power, in addition to upgrading himself.
After Shinbi impales the Underground Nation and slowly dying after his attack, Shinbi says to Kang-lim, “Hey there big guy, there’s someone waiting for you. Someone who misses you very, very much.” then Ryu appears (Meanwhile Shinbi was still dying but is revived at the end due to Hari and Doori's wish).
Birth of Ghost Ball X[]
TBA
The Sky Goblin VS Jormudagri[]
TBA
Ghost Ball Z[]
TBA
Appearance[]
Physical Appearance[]
Ryu has dark green eyes and brown hair tied into a bun with a green hairpin. She is majorly seen wearing a white kimono-like dress or a black valor exorcist suit that Kang-lim used to wear during Season 1.
Episode Appearance[]
Personality[]
Ryu is a loving and caring mother to Kang-lim.
Powers and abilities[]

Kang-lim's mother wielding her two blades.

Kang-lim's mother is using her magical powers.
Like Kang-lim, Ryu is an exorcist who uses a sword and talismans to fight off evil spirits as her abilities are also similarly highly equal compatible with her son, Kang-lim. She is said to be the strongest former member of the Guido exorcist and one of the most powerful exorcists as she faces Underground Nation the King of All Darkness (although surpass by her husband Guido Gon and the former Aegis exorcist, Luman). Although she rarely seen her fighting ghosts, she is more capable of fighting than the Aegis if she directly intervenes in battle while her power is complete, given that she has taken on enemies alone.

Her magical powers by using talismans summons two magical creatures.
Gallery[]
Trivia[]
- She is the only character in the overall series who is aware of the existence of ghosts and goblins.
- Her first name was revealed in Season 4.
- Ryu has many similarities and resemblances to the Ancient One in the Marvel Cinematic Universe.
- Both have high combat power despite being human.
- Both are teachers and masters of the protagonist (Choi Kang-lim, Doctor Strange), and the protagonist's superior.
- Both protect humans from dark beings or entities (Underworld, Dormamu).