stories where characters regret letting go or leaving the
female lead, mostly romance and some family related
https://www.mangago.me/home/mangalist/3061174/ (2)
Isekai BL
Reincarnation, Transmigration
Reincarnated in Another World
Reincarnated in a Game World
Reincarnated in a Book World
Transported to Another World
Reincarnated Lover
Multiple Reincarnation
Reincarnated in the Past
Time Travel
Time Rewind
Part 2:https://www.mangago.me/home/mangalist/3123306/
This is just a list of manhwa/manga which has main character/s who gained a second life in the modern world setup.
Main Characters: Reincarnated/Second Life
Settings: Modern Society
The list is in no particular order.
Feel free to suggest anything in the comment section.