Younghee is a 14 year old girl in Seoul, Korea who is crazily obsessed with the boy band Exo. While on an Exo web page, she stumble across a phone number. Curious, she texts the number and finds out it belong to the Exo manager. After a few arguments and threats, he finally agrees to let Younghee speak with the members. The boys and her begin to get really close with each other and two have fallen deeply in love with her. Younghee didn't know that a simple phone number could change her life for good.