Cho Nali has ruled the fashion world for years - a powerhouse designer known for her fierce style, ruthless perfectionism, and the icy walls she's built around her personal life. When she's asked to design a custom stage look for Mystery Saja, the elusive and enigmatic idol of Korea's hottest K-pop group, she's skeptical. That is, until he walks into her studio - magnetic, otherworldly, and carrying a presence that turns her carefully ordered world upside down.
What Nali doesn't know is that Mystery is more than just an idol. Beneath the flawless visuals, he hides a dangerous truth: he's a demon feeding off the energy of adoration, obsession, and desire - and the spotlight keeps him powerful. But Nali is different. She challenges him, resists him, and for the first time in centuries, he feels something he can't quite control. Their creative collaboration quickly becomes a twisted dance of temptation, where passion and power blur, and neither of them is sure who's really in control.
As their worlds collide under stage lights and secrets, Nali finds herself pulled deeper into a supernatural game she never agreed to play. But with cameras watching, fans screaming, and something dark rising beneath the city's glittering surface, she'll have to decide: is Mystery her greatest creation - or her greatest undoing?