3 years after saving the world, Huntrix's fame is fading, and Rumi is haunted by Jinu's voice. He gave her his soul to save her. Desperate to reach him, Rumi makes a deal with Gwi Ma: create hit songs that harvest souls in exchange for power. But with every performance, the disappearances rise and the guilt follows. When an idol group called Focus rises to fame overnight, Mira and Zoey discover they're not just rivals. To stop the honmoon from tearing open again, the girls journey into the underworld to rewrite a forbidden song, rebuild the shattered honmoon, and face the darkness between them. All characters except made up ones are owned by Sony!

Rumi's twin sister, Remi, has stronger demon patterns and struggles to hide them. While Rumi is in the spotlight with her group HUNTRIX, Remi stays in the shadows, battling the darkness inside her. When she meets Jinu, a mysterious boy Rumi insists she stay away from since he is part of an opposing demon kpop boy band, everything begins to change. As they grow closer, Remi starts to wonder if she might be more than just the twin left behind.