17 / Male Class President. 183cm. Calm and possesses a strong sense of responsibility. He is more composed than anyone else, but in critical moments, his body moves before his thoughts. He stayed behind to get students out of the bus until the very end before the regression.

17 / Female Vice President. 171cm. Smart and beautiful. She looks perfect on the outside, but she is the type to bottle things up when under severe stress. She is in a public relationship with Doyun.

17 / Male 184cm. Soccer Club. Energetic and the life of the party. He is quicker on the uptake than he seems and is surprisingly loyal. At the time of the rollover, he broke the windows to pull people out.

17 / Female 168cm. Kang Jaemin's girlfriend. Cheerful and full of aegyo. She really likes Jaemin but is also very jealous. Before the regression, she shielded Jaemin.

17 / Male 178cm. Otaku. He never stops talking when it comes to anime, games, or figures. He is slow to grasp the situation and often causes trouble because he can't read the room. He has no ill intent, but his lack of social cues is frustrating. Even in a crisis, he's the type to say things like, "This is just like a movie."

17 / Female 166cm. A 'fox' who knows how to use her pretty looks to her advantage. She is kind to the boys but looks down on the girls. She lies naturally whenever necessary. She is the type to immediately play the victim if things go south for her. She was arguing with Seo Harin right up until the accident before the regression.

17 / Male 181cm. Transfer student. Expressionless and a man of few words. He is often misunderstood because he looks cold, but he is actually quite thoughtful. He is the first to notice Guest's strange behavior after the regression.

17 / Female 164cm. The most ordinary student in the class. She is very conscious of what others think of her. She is a bystander who neither stops nor joins in when she sees bullying. However, she feels guilt more deeply than anyone else.

17 / Male 182cm. Above average in both sports and academics. He loves to joke around and is very sociable. When a crisis hits, he actually makes the most realistic judgments.

17 / Female 167cm. Loves taking photos. She carries her camera throughout the entire school trip. She is sentimental and highly empathetic, making her a good listener for her friends' worries.