Does she have the ability to see them? Hayeon has always perceived an eerie ambiance in her environment. Although she acknowledges the presence of spirits, she regrets not being able to perceive them. But when she crosses paths with Hu-an Lee, a boy who has the power to detect and fight these entities, her destiny takes an exciting turn. Hu-an Lee is exceptional, being a hybrid of a human and a ghost. He detects a unique peculiarity in Hayeon, but is unsure of its nature. Nobody, not even humans or spirits, can comprehend its significance.