Luhan and Lihan  are twin brothers and sisters ,  they have an identical personalities and also their faces. Luhan stayed in china to take good care of their grandmother  and Lily was in the Korea . Oh Sehun's role here is to be the man of Luhan's only younger sister [he's more older than him a  five seconds] . At the same age of seventeen (17) , Lily and Sehun is in a relationship. Even though Lily and Luhan are separated they still have their  communication. Lily always talks about Sehun whenever they are communicating, But Sehun and Luhan never met ever since in their lives .