Interesting Introduction of myself

My name is Se-Un Sung.
     I had been the fastest runner in my elementary school when I was 13 years old. When I was at the elementary 4th grade, I was 4th fastest in my class. In the next year, I was 4th fastest in my school. Then I became the fastest in my school. When there was a relay race between different schools, I went as the last runner.
     Another thing is that I'm good at math. I'm the top 1% in my school in the math score. The score was 99.7, which was 3rd out of 358 people in my school. Also, yesterday, my families told me that I was selected as 'math genius'. It isn't hard like MENSA, but it's still hard to do. I applied because I was good at math and I liked math, then after 4 tests, I was selected as 'math genius', which is chosen by local educational office.
     The final thing is that I can play piano well. I started playing piano when I was 8. So I spent 6 years learning and playing the piano. I love playing piano a lot, and I'm still learning it. I can memorize a 7-minute long piano work.