Exo Xiumin's sister

Kim Chae In the sister of Kim Minseok of exo is homeschooled for having a weak and a hole in the heart.No one in exo knows that he has a sister but one day his parents called him to take care of his sister so she will live with him.Kim Minseok is very protective of his sister but will he allow one of the exo member to fall in love with her?Let's find out what will happen