In the year 2123, the world is now merged into one city, 'Uwiron City', and controlled by the powerful government called The Red Onyx.   Kang Seulgi is one of the most elite soldiers of The Red Onyx. While on a mission, she accidentally activated a time machine that brought her all the way back to the year 2019. Aimlessly strolling around the new environment, she met the cold-faced beauty, Irene.   Irene is the leader of the famous girl group 'Black Vel