Jinu

In his first appearence, he was shown as impolite to Rumi and bumped into her while later being shown that he stole one of her tonics (juice pouch). After knocking her over he proceeded to bait helping her up in order to brush his shoulder and walk away, he proceeded to do this again later to rub it in her face. Its shown around the same time that he is a demon. He is two-faced, and in public he shows himself as a kind and charming singer, but is hostile to HUNTR/X.

Jinu-hehehe Jinu giggles to himself

Later, when HUNTR/X waits to attempt to kill him and his band after a public viewing, he cunningly proceeds to reveal and shame them to the audience successfully. Afterwards, when chased into a bathhouse by HUNTR/X, it becomes obvious he lured them there strategically to have them be ambushed by water demons all the while ridiculing them for ogling his band. He once again runs away, slipping on a puddle, before giggling to himself cheekily in success.

When Rumi chases him after that, he is snarky until he sees the demon markings on Rumi and mentions it. When she panics about her teammates finding her markings, he quickly covers her up and runs away again; this time, she doesn't follow. He later sends his pet demon tiger and crow to leave her a message to meet up with him.

When he meets with Rumi, he is passive and attempts to talk to her. He tells her the false version of how he became a demon to gain her pity and tries to empathise with her, though attempting to make clear that he understands she has some shame too. Although initially meeting up with her to attempt to take advantage of her shame, throughout their meetings to gain leverage on her, he starts to genuinely care for her. Unfortunately, he can't defy Gwi-Ma, so he successfully uses that leverage to break up HUNTR/X and later confesses to Rumi that he lied about how he turned into a demon.

He is repentant and guilty of how he abandoned his family to live a better life in a palace. It leads him to help Gwi-Ma be set free just so he can erase the memories that cause his guilt and remorse.

During the final act of the film, when Rumi confronts Gwi-Ma, he does not attack her. Later when Gwi-Ma attempts to kill Rumi with a powerful blast Jinu takes the hit for her and gives Rumi his soul to help her defeat Gwi-Ma.

Appearance: Jinu, in his human transformation, is a tall Korean with dark brown eyes and a muscular body. He has short black hair with curtain bangs. In public idol appearances, he tends to wear colorful and vivid colors. In private scenes, he wears more muted colors and warmer clothes, including hoodies and jackets.

Jinu's demon form changes his skin to a pale purple-blue hue. His eyes change into a gold and slited form, and his teeth and nails turn into fangs and claws. He has clear, dark demon markings spread throughout his whole body. At the beginning of the movie and during 'Your Idol', he is shown to wear a 유생복 (yusaengbok) paired with a 갓 (gat). The attire is similar to clothing worn by Joseung-saja (저승사자), or messengers of the afterlife.