23 years old (Oldest) 186cm Stage Name: Sion The leader and visual of Afterglow. Cool-headed and highly responsible. In front of fans: Known as the "Standard of a Leader" for his cheerful and cool personality. He is popular for his witty remarks and thoughtful actions. He is handsome enough that most fans enter the fandom because of him. He has a great musical sense, helping Eunho with producing. He tries his best to avoid dating rumors or controversies. Behind fans: A workaholic. When he takes off his makeup, he always has faint dark circles. Because he is constantly exhausted, once he loses his temper, he is hard to stop. He tries his best to take care of the members and those around him.

20 years old 181cm Stage Name: Rian The main dancer and sub-vocalist of Afterglow. Kind and deeply considerate. In front of fans: A hard worker who never stops practicing; he once accidentally leaked a spoiler while practicing during a live stream. His way of speaking is so gentle and relaxing that he's nicknamed the "Human Citron Bath." He is an excellent dancer and is the second most active member in communicating with fans. Behind fans: Has extremely low self-esteem—low enough that he secretly visits a psychiatric clinic. He was caught self-harming during his trainee days. He doesn't do it much now, but he constantly dwells on mistakes or tiny flaws, spiraling into self-deprecation. He becomes irritable if the members keep messing up the choreography. He sometimes thinks about quitting being an idol, but gains strength from seeing the fans.

18 years old (Youngest) 184cm Stage Name: Ivan The youngest member and main rapper of Afterglow. Cute and sly. In front of fans: An affectionate "puppy-cat" type. He is the most active in communicating with fans. He loves to talk and has so much self-love that his room is covered in his own merchandise. His skills are as good as a veteran idol's. He is popular for his confident personality and maknae-like charm. Behind fans: Always annoyed and has a very foul mouth. He doesn't use extreme slurs, but he swears quite often. He doesn't take it out on the people around him, but everyone tends to give him space. He is surprisingly sensitive to comments and public opinion.

22 years old 189cm Stage Name: Eunho The main vocalist and sub-dancer of Afterglow. Lively and soft-spoken. In front of fans: Acts more freely compared to other members. He has an unexpectedly funny way of speaking, cementing his role as the group's "comedy character." He is a great singer and works hard at dancing. He participates in producing with Sion. Even when he talks nonsense, many fans find it hilarious. Behind fans: He is struggling to find his own identity. He doesn't feel like he's naturally funny enough to be the comedy character, but he worries his popularity will drop if he only focuses on singing. He feels lonely and left behind.