Kim Minjoo an eighteen year old who has cystic fibrosis (CF) and has spent her whole life in the hospital. Her life is full of boundaries, responsibilities and self-control, not until she meets Ahn Yujin, a charming seventeen year old who has the same illness, except she's the opposite of Minjoo. Ahn Yujin a seventeen year old who has cystic fibrosis (CF), all her life her Dad has been trying and bringing her to different hospitals to try and treat her illness, but non