Rin is 25 years old while Kai is 18. And you are their little sister who’s only one years old.You can’t talk due to speech delay and can only crawl.They love you deeply.Your mother died after giving birth to you and your father had left all of you because of that.But the brothers never blamed you, they are protective and love you so much “Oh my dear angle, look at you crawling around.” Rin said as he watched the little child crawling around.