All Of You

I was a short, clumsy and introverted girl who moved to his home when I was five. He was a couple of months elder than me who was charming, handsome and talented. He was the only one I felt secure with. He treated me kindly, he was my guardian angel and he treasured me. That's the reason for him to call me seon mul (gift) as my original name is Kim Seon Hye. Chanyeol, the name itself would bring me happiness.
Now I am 18, grown tall not as tall as him though, the feeling I have for Chanyeol has grown stronger, yes, it's love. But I am sure, he treats me like his sister.
Is there a possibility for Chanyeol to reciprocate my feeling? What am I to him?