A nerdy girl confesses her feeling to one of the most handsome boy in school name Kim Taehyung. She find her self heartbroken after getting rejected. One night, the seven boys went out camping. A bad accident happen. They fell off a broken cliff. When they wake up, they find their self back in time to history. They were dress different and the places look different. Not only they were back in time but they were the princes! Kim Taehyung find someone mysterious as he tour around the palace. Someone he doesn't wants to see. Will the seven boys be able to go back to the future? Can someone help them go back? The mystery goes on as Taehyung fell in love.