A story about two girls started from nothing as friends, naturally, became each other's everything. Yoona was part of Yuri, as Yuri was part of Yoona. If you fight like a married couple, talk like best friends, flirt like lovers, and protect each other like siblings; its meant to be.

Yuri, the singer and Yoona, the waitress are both engaged to be married but to the wrong people. Fortune intervenes to help them discover each other.