힐러 아니라니까요? (Associated Names)

In the year 20XX, humanity was destroyed— All because of a highly contagious toxic substance. Thanks to my purification skills, I became the last survivor. [Hunter “Kang Yuha” has died.] But when I opened my eyes again, I had returned five years into the past— To the day, S-Rank Hunter Min Hajun, the number one…