A KNIGHT WITH A TIME LIMIT

A Knight With a Time Limit summary:

Minhyuk, a bedridden man in Korea, meticulously counts his waning days when suddenly, he's transmigrated to another world where he gains the new identity of Levis, the Soul Harvester. In this world, Levis must claim lives to extend his own, a haunting paradox that he must come to terms with.
Forced to grapple with a life tethered to a merciless ticking clock, Levis becomes a harbinger of fate, tasked with the daunting responsibility of ending the lives of others in order to preserve his own.
How far does the will to survive stretch? Is one life's preservation worth another's demise?

Minhyuk, a bedridden man in Korea, meticulously counts his waning days when suddenly, he's transmigrated to another world where he gains the new identity of Levis, the Soul Harvester. In this world, Levis must claim lives to extend his own, a hauntin