Chang sun hyuk@wkdtjsgur100SW DeveloperSouth KoreaFollowAboutEducationDankook University BadgesProblem SolvingJavaDays of Code CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Problem Solving (Advanced)VerifiedskillWork Experiencewkdtjsgur100 has not updated employment details yet.EducationDankook University