South Korea’s threat landscape is described as heavily shaped by North Korea-linked actors targeting government, defense, finance, cryptocurrency, media, policy, and technology sectors. Lazarus Group is associated with both espionage and financially motivated operations, including spear-phishing, weaponized document lures, custom malware, supply-chain compromise, and digital asset theft aligned with sanctions-evasion objectives. Kimsuky is presented as a political intelligence actor using social engineering, credential phishing portals, and malicious attachments against agencies, think tanks, academics, and media organizations. APT37/Reaper is described as an espionage actor targeting government, defense contractors, media, and policy institutions with spear-phishing, zero-day exploitation, custom malware, credential theft, and data exfiltration. The DPRK-linked activity matters because it aligns with Pyongyang’s military, economic, sanctions-evasion, and technology acquisition goals.