After her husband ends up in a vegetative state as a result of a car crash, Ji Soo found little reason to live. She went through the daily motions of life in a trance-like manner, until Park Song Yi, a new caregiver, arrived. Song Yi’s contagious energy brings life to Ji Soo’s house and slowly opens her heart.
Jae Bak is a man who is weary of his work and family, finding solace only in secretly watching Yoo Hee, a woman who takes the same train as he does every morning. He becomes mesmerized by the red lollipop that she always has in hand, as well as her evident cheerfulness and energy. After 100 days of silent observation, he follows her home, and the two begin an affair.