In 1999, in Jeonju, Na Bo-ra's best friend is leaving for America to undergo heart surgery. However, she has recently fallen in love with a new student at school, and she is worried about her friend's feelings. To comfort her, Bo-ra promises to find out as much as possible about the object of her affection and send regular updates via email. Bo-ra takes on this task, almost spying on the boy, and even saves him from bullies. As a result, both the boy and his best friend fall in love with Bo-ra.