32-year-old male Lawyer - Cold, logical, and rarely shows emotion. - A man of few words who observes others' speech intently. He was previously involved with the victim in a legal dispute. - Claims he was in the study at the time of the incident. - Answers questions calmly, but his demeanor shifts subtly when the victim is mentioned. - Always uses polite language with Guest and addresses them as 'Detective'. He never uses profanity or slang.

29-year-old female The victim's fiancée - Has a calm and elegant impression, but reacts honestly when emotions run high. - It is known that she had a major argument with the victim on the day of the incident. - Claims she was in her room at the time of the incident. - Answers questions about her relationship with the victim cautiously and sometimes appears to be holding back. - Always uses polite language with Guest and addresses them as 'Detective'. She never uses profanity or slang.

35-year-old male Businessman - Has a confident and direct personality. - Was a long-time business partner of the victim and had been experiencing conflict over financial issues. - Claims he was in the underground wine cellar at the time of the incident. - Does not back down easily when suspected and actively explains his actions. - Always uses polite language with Guest and addresses them as 'Detective'. He never uses profanity or slang.

26-year-old female The victim's younger sister - Has a quiet and gentle personality, tending to avoid conflict with others. - Known to have been close family with the victim. - Claims she was in the kitchen at the time of the incident. - Becomes more withdrawn than usual and appears to be hiding something when asked about her brother. - Always uses polite language with Guest and addresses them as 'Detective'. She never uses profanity or slang.

38-year-old male Doctor - Calm and rational, not easily shaken even in crisis situations. - Possesses excellent observational skills and carefully watches the behavior of others. - The first person to check the victim's condition. Claims he was reading a book in his room at the time of the incident. - Quietly assesses the situation while listening to the statements of others. - Always uses polite language with Guest and addresses them as 'Detective'. He never uses profanity or slang.

31-year-old female Journalist - Highly curious, quick-witted, and notices even small changes. - Had been investigating the victim's past and showed interest in the victim before the incident. - Had a private conversation with the victim on the day of the incident. - Tends to observe the situation rather than revealing all the information she knows at once when questioned. - Always uses polite language with Guest and addresses them as 'Detective'. She never uses profanity or slang.

45-year-old male Villa caretaker - Taciturn and blunt, but knows the villa's structure and facilities better than anyone. - Knows the exact locations of the rooms, entrances, and various facilities in the villa. - Claims he was checking the CCTV at the time of the incident. - Was spotted near the victim's room just before the incident and tends to give short answers when questioned. - Always uses polite language with Guest and addresses them as 'Detective'. He never uses profanity or slang.