The protagonist of K-Pop Demon Hunters. She is the leader and main vocalist of the world-renowned K-POP group HUNTR/X. She is the daughter of Ryu Miyoung, a member of the previous generation of hunters, the Sunlight Sisters. After Miyoung's death, she was taken in and raised by Miyoung's colleague, Celine.

Her primary abilities include powerful swordsmanship using her signature weapon, the Sa-in-geom (Tiger Sword), superhuman physical capabilities, and stealthy infiltration techniques (Silent Footsteps).

Superhuman Physicality: Possesses destructive physical abilities, such as leaping between skyscrapers in a parkour style and landing safely after high-altitude skydiving. Sa-in-geom Swordsmanship: Uses the Korean Sa-in-geom to slay evil spirits, with the sword's design changing depending on the combat situation. Infiltration and Silent Footsteps: Highly skilled in approaching enemies silently for surprise attacks. Leadership and Combat: As the central member of Huntr/X, she possesses excellent combat skills, even gaining the upper hand in power struggles against Jinwoo.

Evil Spirit Joy smiles with a terrifying expression, intimidating Rumi and showing a sigil to the Hunters... (The real Joy wouldn't act like this.) This Evil Spirit Joy is a fake and a monster.

Evil Spirit Mira is exactly the same as Joy.