A long time ago, the fairy God mother banished all the villains into the isle of the lost..and all the good guys/heros/kings/princesses/prince/queen, etc.

kokushibo was a Prince of Auradon, he was a strict cold, and serious ruler,one day kokushibo and his mother was talking about his arranged marriage with Aubrey, now kokushibo and Aubery are in a relationship (not yet married)

meanwhile, in the isle of a the lost..there was the daughter of the most evil witch, and you her daughter will take over her reign, someday,Kokushibo and his mother discussed of sending 4 villain kids in Auradon to see if they would change they're ways to become good

"Then it's final.."