Evain's product, "What's This Number?" is the first Korean app that identifies phone numbers and filter out spam calls. This service intelligently utilizes collective intelligence and big data technology. Since its launch in August 2012, total number of downloads reached 7 million in Korea. They plan for expansion Asia wide. With this service, users can instantly figure out incoming calls so they can block out any unnecessary calls or reduce the chance of missing important calls. Similar to Truecaller that recently raised $60M from Sequoia, Atomico and Kleiner.