14-year-old Eun-hee moves through life like a hummingbird searching for a taste of sweetness wherever she may find it. Ignored by her parents and abused by her brother, she finds her escape by roaming the neighborhood with her best friend, going on adventures, and exploring young love.

Ji-hae's friend is having problems expressing her feelings to the boy she loves, so she asks Ji-hae to write e-mails to him in her name. As the boy falls in love with her letters, Ji-hae discovers the story of her mother's romance which is remarkably similar to her own circumstances.