It's pretty good. It throws pretty unconventional problems at MC and the guy himself isn't an infantile psychopath like oh so many MC's tend to be. The only thing I find pretty weird is how that world's countries been constantly abducting all sorts of experts from Earth yet the level of development is your usual medieval fantasy.
The plot/story is the same thing you have read on all revenge stories: Goodie shoes guy is betrayed by his lover/crush or stolen away from his best friend/childhood friend. It's a light revenge story the violence against the people that betray him is replaced with kindness and merits. If you like this kind of stories then you might enjoy this...
That said spoilers start next for the first 5 chapters
That said spoilers start next for the first 5 chapters