Yaoi_sad"Manhwa

In a desolate world where nothing remains but bitter, crushing cold, a man named “Changjo” lives on alone with the robust health he was born with, surviving bravely by himself.
In a village left empty after everyone else has died, Changjo works as a gravedigger and uses the knowledge he learned from books to handle all kinds of tasks.
One day, he discovers “Yeonhwa” collapsed in the snow and brings him back to his home…
“After you suck it, then you combine.”
Using the knowledge he learned from b