In the future world of 2080, human technology has advanced so much that they have produced a large number of robots to do some low-level work, while humans enjoy everything. In a place called "Natural City", robots have replaced almost every human job, from construction workers to dancers. However, the humans set a deadline for each robot, at which time they are recycled and destroyed.
Many smart robots don't want to accept their fate of being destroyed, and they refuse to be recycled, so the humans set up a specialized MP unit to deal with those robots that resist recycling.R (Yoo Ji-tae), an elite member of the MP unit, is tasked with eliminating expired robots that refuse to be recycled, and unexpectedly R falls in love with a female robot, Ria (Seo Lin). ).
Lia is a robot dancer with near-perfect beauty, especially her sweet smile when dancing, and R is in love with her, but it doesn't last long, as the deadline for her to be recycled and destroyed is coming up, and she only has 10 days left to live. R is unable to accept the destruction of his beloved girl, so he tries to find a way to extend Lia's life. After a thorough investigation, R finds Dr. Chloe (Jung Eun-pyo), who illegally modifies robots, and learns that the only way to save Lia's life is to implant Lia's chip in a young girl.......
In order to save his beloved girl's life, R decides to take the risk of finding a human girl in order to implant her chip, so as to save her life and save the life of the girl he loves. R finds a beautiful girl named Shixin (Lee Jae-yin) and starts to approach her, but R can't bear to do anything to the kind and innocent Shixin no matter what, and Shixin has already fallen in love with R. While R is hesitating, Shixin is kidnapped by someone, and R immediately rushes to rescue her, and he realizes that he has fallen in love with this human girl as well. However, the female robot Lia's life is getting shorter and shorter. Seeing that the 10-day deadline is approaching, who can save her life?