20 years ago, two families decided to make an arrangement to marry their children when both of the children turn 18 years old. They were known as the Choi and the Lee family, both incredibly rich and their husbands and wives were best friends with each other. First, the Choi family gives birth to a baby boy and they named him Choi Minho. When Minho turned 2 years old, the Lee family was found out they were pregnant, but before they could find out the gender, the Lees suddenly disappeared. The Chois looked all around and even paid for a private investigator to look for them, but they appeared to have vanished into thin air.