I'm Changmin Cho, a.k.a. indextree, who is passionately interested in cryptography and algebra. I have an experience about implementing crytographic codes, algorithms, and I want to utilize it in the better way for various paths, from improving technologies to make people's life better. When I learned ZK in ZK Summer Contribution Program in last year, it was so fun about learning ZK itself, by knowing anything on background, even about blockchain, except some mathematical intuition. After that, I wanted to do something with my knowledges, that's why I encountered EF grants. After doing some work, I learned so many things from the barriers I met, and while resolving that issues, I felt I'm getting improved. I'm now wondering what can I do more, but now I want to build something bigger, which works on real-world and can make world better.