A strange girl Joo-young walks along the streets of Seoul with dirtied and ripped clothing. Y/n finds her in this state and being the soft kind hearted person she is, she tires to help not knowing Joo-young is an alien who was held captive at an super top secret lab that held dangerous things no one knew of and she was one of the few who escaped. The whole world had no clue about the lab but they are determined to keep it like that by hunting down Joo-young to keep their secret safe.