Yoo In-soo as Yoon Gwi-nam After appearing in dramas like "Gangnam Beauty," "At Eighteen," and "Stranger 2," Yoo In-soo has taken on the role of a bully named Gwi-nam in "All of Us Are Dead." According to the actor, when the zombie apocalypse happens, Gwi-nam does "whatever is necessary to survive" and eventually becomes "a bigger threat to the survivors than zombies." Where to Follow Yoo In-soo on Social Media Instagram: @k.a_innsoo