Kim Hana is a normal teenage girl who lives alone in an apartment in Korea. Her life is soon to be changed in many ways when she bump into someone in the grocery store.
Her whole life, she's learned to be happy, cheery and bubbly. That's what she loves to do the most. Everything that requires smiling, laughing or just having fun is on her list. His whole life, he's shut almost everybody out, annoyed by their presence and the fact that they're breathing the same air as him. Whatever...