Thank you! I didn't know 遺憾 is more severe and have been using it interchangeably with 後悔, thanks for letting me know 😅

I am happy that It helped. :) I used some English words interchangeably. I didn't know they were actually different until native speakers told me. I can relate to you. :)

Sometimes, dictionaries don't tell you how people use the words specifically in real world. That is why it is good to have this kind of website where you can learn from native speakers. :)

By the way, I am trying to read more in English to improve my writing.

It seems that you read a lot.

I am wondering if you have any non fiction English book recommendations. Thank you :)

I don't read nonfiction as much as I should but here are some that I've enjoyed in that past. From what I remember, the language should be pretty approachable?

* My Life in France by Julia Child
* Say Nothing: A True Story of Murder and Memory in Northern Ireland by Patrick Radden Keefe
* The Perfect Scent: A Year Inside the Perfume Industry in Paris and New York by Chandler Burr
* From Here to Eternity: Traveling the World to Find the Good Death by Caitlin Doughty

It's nice of you.
I appreciate your recommendations a lot. :D

Glad to help!

Thank you!