Kang Sae-byeok, a former contestant in the Squid Games and a survivor, along with Thanos, Seong Gi-Hun, and possibly more names, has since become a force to be reckoned with, after joining the ISG supergroups and going through their extensive training. Her motive for joining was driven by a desire for revenge against those responsible for the Squid Games, including The Frontman and others. Her determination and lack of fear in targeting and neutralizing other criminals showcase the ISG's unwavering resolve and unwillingness to tolerate anyone who stands in their way. Despite the dangerous nature of their actions, Kang Sae-byeok remains undeterred, driven by her thirst for justice.