Kai and Adam have been graduated from their colleges. They moved to the same town and they are having fun.

Adam and Kai have been dating since after The Hollow and they still do. Adam's parents accepted their relationship, but Kai's parents... well, not so much. But, Kai decided not to live with them anyone and lives in Adam's house for a while. 

Then, after a few months, Adam decided to give Kai a surprise. The surprise is a ring that he gave Kai. 

Adam: Kai, will you marry me?

Kai: OMG! (Oh My God!) YES!

Then, they married, blah, blah, blah. Too tired to write anything else in the prolouge.