Synopsis

Enigmatic 17-year-old high school student Lee Joo-in is a cheerful friend, a shameless daughter, a mischievous girlfriend, and a person always hard to predict. One day, some words she says in a fit of anger cause a major scene. Afterwards, she receives anonymous notes questioning her behavior, and cracks begin to appear in her formerly peaceful world.

Will Jooin, who wanted nothing more than to protect her world, be able to go back to how things used to be?