After the Divorce, I Took the Exam and Became His Son's Class Teacher.

I Want to Read Cool Articles, but I Need to Have a Brain

It can be any type, whether it's about survival or about the city, but it must have a brain, not brainless, and be determined to fight. It's fine if it's a two-male protagonist, but don't just fall in love. I hope the plot can be strong, and no CP is better.