Seeker's: The Strongest Middle-Aged Man in the Labyrinth Becomes the Best Video Distributor.

The story is set in a world where Seekers, a profession that involves broadcasting dungeon strategy guides, are ranked number one in the list of most desirable professions. Rin, a rich girl who works as a low-tier Seeker, has an uncle who is a low-tier streamer that she can't take her eyes off for some reason. His name is Tooru. Although he looks like an ordinary old man, he displays surprising powers when Rin is in trouble...

(Source: Natalie, translated)