Three kids develop a sibling-like bond after living in one family - but how will this develop once they become adults? Because of some accidents of their families, three unrelated children have become new family members, living under the same roof together and supporting each other. However, the damages caused by their original families remain, and those who hurt them before crash into their life again, trying to separate them by the titles of their original family members. On the one hand, they have new family members that they cherish, and on the other hand, they have indifferent biological parents that leave them no choice. They confront the difficult situation bravely and try to make their parents realize their own problems. Only by healing each other as family members, can they go head fearlessly and turn into better selves.