Why Is My Brother so Adorable?

I am his biological brother, but for some reason I did not return to my home until I was five years old to understand him and take care of him... I know that he is dissatisfied with himself, but I still hope that I can care and take care of him... Even though he no longer needs my care, I will still care about him silently and do whatever it takes for him... Unknowingly, the past feelings slowly changed and became... Fear of being disliked, fear of facing, fear of losing Protect,, the love becomes deeper and deeper,,