What if the concept of love was taught in school? It's the year 3000 and now love is part of the school curriculum. In elementary school you get taught to love your parents, in middle school you get taught to love your friends and fellow humans, and in high school you start to learn about romantic love. In senior year you get a genetically modified humanoid whose sole purpose is to be loved and love you. What happens when Kim Jonghyun gets a love-humanoid by the name of Key? Will he remember

Taemin is forced to live in the streets, and suffer for his wealthy father's mistake (Better description in foreword).