Kai Song (@exp-sky) is a senior security researcher at Tencent Security Xuanwu Lab. He is experienced in software vulnerability exploitation and vulnerability discovery. He is also the winner of Edge Browser category in Pwn2Own 2017 and Tianfu Cup 2018, 2019. He has been recognized by Microsoft MSRC as the world's most valuable security researcher for five consecutive years, and his highest ranking was 12th. Since 2015, he has won Microsoft Edge Bounty and Mitigation Bypass Bounty Program several times. He has presented his security research at many security conferences such as AsiaSecWest, HITCON, and China Internet Security Conference.