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Beist has been a member of the IT security field since 2000. His first company was Cyber Research based in Seoul, South Korea and first focused on pen-testing. He then got a Computer Engineering B.A. degree from Sejong University. He has won more than 10 CTF hacking contests in his country as well as passed DefCon quals 5 times. He has run numerous security conferences and hacking contests such as SECUINSIDE and CODEGATE in Korea. Also, he has given talks at BLACKHAT Las Vegas, SYSCAN, CANSECWEST, AVTOKYO, HITCON, SECUINSIDE, EDSC, and TROOPERS. Hunting bugs and exploiting them are his main interests. He was one of GRAYHASH company founders now acquired by LINE which is a leading messenger company in Asia. He is ex-CISO of LINE Plus.