In the heart of a tumultuous Joseon, fiery shaman Yeo-Ri wants nothing to do with her fate as a divine medium. But when her first love, Yoon-Gap, returns under tragic and bizarre circumstances, she is thrust into a dangerous web of gods, ghosts, and palace politics. Possessed by Kang Cheol, an ancient Imoogi (serpent spirit) who failed to ascend to dragonhood, Yoon-Gap’s soul battles the spirit within, revealing a dark truth far beyond madness. As deadly hauntings grip the royal palace, Yeo-Ri becomes entangled with Palcheok-gwi, a vengeful spirit seeking revenge on the royal family. Alongside the reluctant reformist King Yi-Seong, who once outlawed shamans, and the tormented Yoon-Gap, now battling a dual soul, Yeo-Ri must uncover the palace’s dark secrets before vengeful spirits destroy everything they hold dear.