Rain Bi, once known as Jung JiHoon, worked for the government as a special scientist along with doctor Lee Hyori before he ran away after rescuing three extraordinary toddlers from being test subjects of a huge governmental experiment known as Project Paragon. The government had specifically labeled the three children as EXP-J.918, EXP-K.114, and EXP-L.313 to differentiate them from one another. Jun