Cheon Yeo-ri, a perfect chaebol heiress, carries a curse that makes anyone she touches see ghosts. Passionate prosecutor Ma Gang-wook, who gets entangled with her at a crime scene, begins seeing spirits after one 'mistake' by Yeo-ri. To stop the ghosts, they must stay in close contact; to hide the truth, they enter a fake engagement. As their partnership turns increasingly dangerous, their hearts draw closer. A sweet yet deadly cooperative romance between two people more dangerous than the ghosts themselves!