This story is sooo worth it. You are not wasting your time, I promise. You'll love it. This story is not an isekai but actually normal earth that was invaded by another world. The plot and character development is so amazing and keep you on the edge of your seat. I admit I have read plenty of story like this and this remain one of my top 5. It's on the second throne actually.
The manhwa is not yet complete but if you can't wait for the next season to start...you can always read the web novel..its completed btw. For me, the web novel contains much more humour than the manhwa itself. Because I realized its hard to include stupid things that SJW noticed about his subordinates behaviour during a serious battle scene. So I recommend you read the web novel if you want more piece of SJW :)
Solo Leveling