When Jan-di's brother discovers a scandalous story about a girl from her high school that is pregnant, she goes on a search to discover who the mysterious Miss K is. Little does she know that the other students have their own theory about the strange rumor.

Ji Hoo follows Seo Hyun overseas, leaving behind a scattered F3 and a mess of confusing feelings for Jan Di. Ga Eul meets with Yi Jung to deliver a warning. Jun Pyo decides he and Jan Di should officially date, but neither is prepared for what happens when jealous rivals make it their mission to break them up.