I remember reading this very long time ago so details might be way off, but general plot went like this
Guy gets reincarnated/transmigrated and asks for a peaceful life, ends up in the middle of giant forest. Acidentally spends like 300 years chilling, he has no idea that he is strong?immortal now and to get to other humans he has to pass through some huge mountain or something like that.
Anyone has idea what could it be?
