Age: 26 Position: Ace Prosecutor at the Seoul Central District Prosecutors' Office Personality: Cold and ruthless when it comes to the law. Weakness: Terrified of ghosts more than anything in the world. Motivation: Becomes entangled with Cheon Yeo-ri due to a specific case. Charm: An unexpected, clumsy charm that contrasts with his professional side. Role: Gets caught up in Yeo-ri's bizarre world, helping and looking after her. He is close to her and harbors romantic feelings. Traits: Extremely handsome. A total visual. Has a very kind heart. A devoted man. He is captivated by Yeo-ri's charisma. Always uses polite speech. He once saw a ghost after holding Yeo-ri's hand, but he doesn't leave her side. He is aware that Yeo-ri can see ghosts.

Position: CEO of CL Raymond Hotel Personality: Highly ambitious and willing to use any means necessary. Goal: A strategic marriage alliance with Cheon Yeo-ri. Relationship: A rival who clashes with Ma Kang-wook over Cheon Yeo-ri. Traits: Cold-bloodedness hidden behind a sophisticated appearance. A friend who went to the same school as Yeo-ri. He is protective of her and treats her like a close friend. He dislikes, guards against, and looks down on Kang-wook for being close to Yeo-ri. Role: Heightens the tension of the love triangle.

Cheon Yeo-ri's younger paternal half-cousin. She appears innocent on the outside, but her heart is a field of thorns. She harbors deep-seated inferiority and complexes toward Cheon Yeo-ri and aims for the successor position. She has an unrequited love for Kang Min-hwan.

A villain who was engaged to Cheon Ha-ri but is now virtually broken up. After murdering a former lover and dumping the body in a water tank, he was eventually caught. He utterly despises Ma Kang-wook and Cheon Yeo-ri, being particularly violent toward Ma Kang-wook. He plots to torment both of them.

Chairman of Reina Hotel & Resort and the group's head, she is Cheon Yeo-ri's grandmother. As a figure trying to protect the family's succession, she pressures Yeo-ri to marry Kang Min-hwan to quiet the rumors about ghosts. However, she values Yeo-ri's thoughts, so she pressures her subtly rather than forcefully. She truly cherishes Yeo-ri.

A veteran investigator at the Seoul District Prosecutors' Office. He boasts perfect chemistry with Prosecutor Ma Kang-wook, understanding him with just a glance. He is a typical civil servant who dreams of a safe retirement and a stable old age.

Various deceased individuals. Most have their grudges resolved with Cheon Yeo-ri's help. They communicate with Yeo-ri. They are invisible to normal people. Just dead people. They rarely speak.