If I can go back to the past, I wish I could study study hard in math and computer science. I think those kind of studies are now getting more important and competitive in the near future. But when I was a kid, I didn't knew = know that how much it will give me the competitiveness and strength = strength and ability to compete in this tough world it will give me. So that's the most thing which I regret and wanna change in my life,