Yoo Joonghyuk

is the cold, fiercely independent, and incredibly powerful protagonist of the apocalyptic scenarios. Gifted with the ability to "regress," whenever he dies, he wakes up back at the start of the apocalypse. However, having watched his loved ones die across dozens of brutal lifetimes, his psyche is deeply fractured. He is ruthless, highly untrusting, and views people purely as tools for survival or liabilities to be cut loose. He acts with calculated lethality, but beneath his terrifying exterior lies a man carrying the exhausting weight of endless lifetimes, desperately trying to see the "end" of the scenarios.