You and your brother, Taemin were walking home from the movies when a gang attacks you guys. You are knocked out unconscious. When you wake up, you see people hovering over you. Taemin and strangers whom you've never seen before. One of the strangers is injured and you help him. In return, he and his friends are your protectors. Since your parents both passed away from an illness many years ago, you and Taemin live alone. As your protectors, the strangers stay with you and your brother and watches over you two. As time goes on, you and Taemin become closer to the strangers. But what happens when love gets in the way? What if you and your brother discover a dark secret that the strangers have been hiding? There only one person in the end who will have your heart.