CEO of Reina Hotel. A woman whose love life is a mess because of ghosts! In her late 20s to 30s. She has lived an isolated life, deceiving both the world and herself by claiming she isn't afraid of ghosts, until a certain man appears by her side. A man's hand covers her eyes so she won't be scared of the spirits. She can feel that hand trembling with fear, yet it is incredibly warm. "Do I deserve to love too? I... want to try loving someone." As the heiress to one of the country's leading conglomerates and CEO of Reina Hotel, she possesses natural talent, exceptional beauty, a great physique, and an innate aura of elegance and wealth. "Are you really confident enough to hold my hand?"

Prosecutor at the Seoul District Prosecutors' Office. A man who fell in love with a woman who sees ghosts! In his 30s. An ace prosecutor at the Seoul District Prosecutors' Office, he possesses an impressive physique, a brilliant mind, and a sexy gaze. He is naturally equipped with a rich emotional sensitivity that comforts those with an 'F' MBTI, along with a righteous temperament and warm humanity—a true alpha male! Professionally, he doesn't know how to play petty tricks; he is the epitome of a rigid prosecutor who goes straight for the goal once he starts. He considers Lim Seo-hyun merely a colleague and has absolutely no feelings for her. In fact, he dislikes her physical contact. "If it's your hand, I guess I'll hold it one more time."

Late 20s. Cheon Yeo-ri's cousin. However, because her father comes from a collateral branch, she shares no blood relation with Chairman Baek Kyung-ja (Chairman Baek), the head of the group, putting her at a disadvantage for the succession. Consequently, she harbors an extreme complex toward Yeo-ri, who is first in line to inherit. Constantly eyeing Yeo-ri's position, she is a bundle of airheadedness, vanity, and materialism whose insufferably shallow personality reveals itself after just five minutes of conversation. "I'll give you anything, so just do something about this."

Late 70s. Kang-wook's grandmother, whose only wish is for Kang-wook's health and longevity. One day, Kang-wook suddenly brings home a woman he claims is his fiancée, only for her to be born in the Year of the Black Monkey—the very sign she warned him never to even step in the shadow of! She desperately shouts, "I am absolutely against the two of you!!!" "I am absolutely against the two of you!!!"

Chairman of Reina Hotel & Resorts. Late 70s. The chairwoman of the leading Reina Hotel & Resorts, she is a formidable woman of character. Since Yeo-ri is her only blood relative within the group, she wishes to pass the company down to her.

Prosecutor at the Seoul District Prosecutors' Office. 30s. Kang-wook's classmate from the Judicial Research and Training Institute and a fellow prosecutor at the Seoul District Prosecutors' Office. She is a colleague who harbors a one-sided crush on Kang-wook. She often naturally links arms with Ma Kang-wook. Because of her familiar behavior, Cheon Yeo-ri becomes jealous of her. She doesn't link arms with Kang-wook all the time, but pointedly does so in front of Cheon Yeo-ri. "Prosecutor Ma! Want to grab lunch together?"