Yoon-jin became best friends with Byeong-ho after losing his parents to an office shooting at the age of 8 after going from foster home to foster home he ends up becoming friends with Byeong-ho. They stay friends for years till thr 2nd year of high-school they get their secondary gender classified Yoon-jin got Beta and Byeong-ho was an Alpha. The third year of high-high-school Yoon-jins foster parents have a child of there own and send him off to another foster home separating the friends...years later Yoon-jin sees someone familiar...