You/ Kim Sooyun You have your secrets. Your brother is Myungsoo aka L of Infinite but you are not blood related. He thiks you are adopted but only you and L's father know the truth. You call him father too. You and L are like real brother and sister and the rest of Infinite sees you as their sister too. You moved in to L family as you were 10 years old. You are two years younger than Myungsoo.