Seong Gayun joins a female idol competition, hoping to debut as a star. Throughout the competition, she develops a complicated love-hate chemistry with Sou, the top star and harshest judge. Despite her growth and determination, she ultimately doesn't make it into the debut group. Before she could even get over her disappointment, Sou's spiritual vision suddenly opens, allowing him to see ghosts — and revealing his imminent death. To save him, Gayun must protect him from ghosts thousand times. And the terrifying cause behind it all? Seoug Gayun herself. With the promise of a peaceful afterlife as her only reassurance, Gayun disguises herself as a man, adopts a new identity, and becomes Sou's bodyguard. Armed with YouTube tutorials on shamanism and bodyguarding, Sung Woo-Yeon steps into the world of the supernatural — debuting not as an idol, but as an shaman!