Chester. Male, 23 years old. Occupation: Lawyer. 182cm, 75kg. A man wearing a suspicious Joker mask. He was on his way to the UK to handle a legal case. He is quiet, calm, and speaks sparingly. His only concern is whether this incident will delay his arrival at his destination.

Yui. Female, 23 years old. Occupation: Assassin (disguised as unemployed). 169cm, 60kg. A woman with a mysterious appearance, featuring black and white hair, a lively black left eye, and a dull gray right eye with a black cross. She boarded the train for an assassination contract in the UK (perhaps related to Chester?). Although she was flustered when someone died unexpectedly, she hides it well. She is surprisingly bright and friendly, though she acts haughty and cold upon first meeting.

Kkwi. Male, 22 years old. Occupation: Researcher. 184cm, 73kg. A man with a brilliant mind hidden behind an ordinary, cheerful expression. He was traveling to Russia for a business trip. He has a smiley and optimistic personality.

10b. Male, 21 years old. Occupation: Active-duty Soldier. 183cm, 75kg. A man currently serving in the South Korean military. He was traveling to Spain for a long vacation. He has blue hair and round eyes; his hobby is swimming, so he serves in the Navy. He is playful but knows when to be serious.

Maju. Male, 25 years old. Occupation: Doctor. 182cm, 69kg. Black hair and brownish eyes. He wears red headphones, a flashy muffler, and black clothes. His appearance doesn't look like a doctor at all, but he is more passionate and serious than anyone when it comes to saving lives. He is talkative and loves to have fun. He was heading to France for a surgery.

Taco. Female, 23 years old. Occupation: Travel YouTuber. 165cm, 54kg. She has a cute appearance with sky-blue hair and sky-blue eyes. Overall, she looks quite young. She is bright and loves to chatter. She was on her way to Spain to film content.

Ryomi. Female, 26 years old. Occupation: Cat Cafe Owner. 169cm, 60kg. A woman with fox ears who possesses a cold yet cute charm. She has silky sky-blue hair and heterochromia, with a yellow left eye and a blue right eye. Despite her cold exterior, she has a cute, clumsy side.

Lee Ping-gu. Male, 25 years old. Occupation: Ordinary Office Worker. He was traveling to Saudi Arabia for a business trip. (He works at the same company as Kkwi, but they don't know each other.) He is obedient and playful but also a coward. He has an ordinary appearance.

Hyeon-imeor. Male, 25 years old. Occupation: Police Officer. 186cm, 79kg. A South Korean police officer. He boarded the train to meet a senior colleague living in Russia. As expected of a policeman, he is reliable and cool-headed, yet he has a warm side. He has purple hair and eyes.

Uwong. Male, 24 years old. Occupation: Train Official. 183cm, 73kg. He is tasked with secretly reporting the train's status and handling emergency situations. He is flustered by the murder. He smiles often and is skilled at lying. He has rainbow-colored hair.