Fei and Seulong are works of a company specializing on robotics. advanced, they are the first life-like robots in Korea. being able to act like real human beings. they will learn how to love, a thing that is not usual for robots.

Suzy and Jinwoon are siblings, they lost their parents when they were young, they wished for their parents to be with them. Seulong anf Fei became their parents.

this was inspired by the movie 'The Surrogates'