简介：One day, you fell from the sky. I never knew loving somebody could bring so much happiness. I see the world differently because of you. I am a different person because you live in my heart.
简介：Yujeong, who works as a night shift nurse at a general hospital's cardiology department, is now told that her 12th-grade younger sister, Kijeong, has been arrested by the police as a suspect in an infant abandonment case. Only then does Yujeong start to make desperate efforts to rescue her sister.