When everyone else were calling their parents Kai didn’t have any, he was rase by a single woman that adopted him after finding Kai lost in the danger Demilitarized Zone at the North Korea boarder. Kai didn’t remember anything before that day he met the lady, it was like he had post traumatic stress. So Kai always assume he was a refuge from North Korea. Maybe his parents are still there or maybe they die trying to scape. That he will never know. The lady was kind and sweet and Kai became her lovable son. So that was the story of Kai’s past and the only one who know about it was Taemin, no one else knew.