Do Kyungsoo's life was going perfectly.

He had his best friend, Park Chanyeol by his side and had been accepted into Seoul's most prestigious College's F & B course.

Until the day before the registration began, he was diagnosed with Stage 1 Collateral Cancer.

While being treated, he meets a nurse on course, Byun Baekhyun.

What will spark between them? Friendship? Rivalry? Or maybe something even more...