By the start of the story the protagonist was a nothing burger, spent 2 years leaning the world he is sent to. Then his personality is shown quite inconsistent, against thieves who try to kill him, not one, twice but thrice by chapter 31, he let her live at most getting some of her money. But against "knights" who he stumble upon during a forced plot event he massacred all 50 of them.
Then add the trope of old guy with childish mind enough to accept being "forced" to carry a brat but keep bickering with her.
Then add gender blender where the author makes the now "loli" MC be drunk, without any clothes, for enough period of time, with 3 guys who abducted said drunk MC, got him naked, in the bed, then show merrily talking to each other with said naked MC now with a sheet drapped over him. And nothing happened. The author didn't even have the guts to go all the way and make it truly dark.
And with what GruntZone360 spoiled with his review, hard to like this one.
Btw MC have 70 years of training and fighting, know how to train and says this new world is better to train, got a new younger body and a reason to pour his all into revenge training, yet...
(my conjectures)Well, most likely he will "fall" become depressed, be cheered up of by his "companions" who he stayed with by less than a month and most all of them have a heart of gold, will be taught new skill while going on a "great" adventure, than he surpass their bottom level skill, villains apear once again do some shenanigans, party is dead or split, new party new clue to become male again, rinse and repeat.
Aside from that, not that the plot of this Manhwa, where villains who can teleport and spies on a guy who got at the top 20 in the world, use an plot device tho make him weak as a little girl, know where he is, at just need teleport once more, send a spell his way and end the story, have any hole big enough to became a sea if filled with water.