Park Chanyeol, 22 year old young adult who's living on his own in an apartment not to far from his college. He may seem to be a happy virus and all, but that's just a mask he puts on a show. Chanyeol continues to live in the past, not wanting to let go of his beloved partner.

Lee Jihyun, 20 year old girl who has just turned into a young adult. She was once Chanyeol's girlfriend. However, that all changed when she was involved in a car crash, losing her memories. She remembers everything but Chanyeol.