A Century in a Dream Made Me a Medical Sage, and I Awoke Invincible

[Invincible hero, feel-good urban fantasy, no messy romances, no dragging things out]

While climbing a mountain, he hears that his family has been slaughtered!

Then he's pushed off a cliff himself!

By chance, he falls into the Drowning Dragon Pool,

and dreams for a hundred years!

When he wakes, he has become a Medicine Sage!

He returns as an invincible powerhouse, ready to dominate!

He'll settle every score and repay every grudge...