Set in the generation of the fully-funtioning droids, Kim Jinhwan lives a caged life in the basement of a high rise building with his companion, AI Doctor Kim Hanbin.They begin to see changes in their routine living when Jinhwan finds Jiwon unconscious on the street, and brings him home to get Hanbins help. With Jiwon setting a permanent foot into their lives comes uncovering of hidden truths and dealing with things that none of them were able to predict.