The worlds of Lee Gon, the ruler of the Korean Empire, and Jung Tae Eul, a police lieutenant of the Republic of Korea, are closely intertwined with each other. It's just that no matter what lovers do, they break up all the time. Traveling in time, they gradually learn the terrible truth: only one of the two twins can exist, otherwise chaos will begin and the whole world can be destroyed ... Now they are faced with the task of not only protecting each other, but also preventing the end of the world. Meanwhile, their mysterious enemy is hiding in the shadows, preparing to strike a crushing blow.Will Jung Tae Eul and Lee Gon survive in an unequal duel with fate and time itself? Will they find their cherished happiness?Now that almost all the secrets of the past have been revealed, only one mystery remains - who was the stranger who saved Lee Gon as a child. That's just the answer to this question can destroy everything ...