Although guys in isekai type stories are common, BL or yaoi and shounen ai are harder to find I decided to make this list. If yall know any not on the list feel free to share.
Check out my Part 2 list for even more!!!
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
Age Gap
Older Male x Younger Female
Adult-Student Relationship
Teacher-Student Relationship
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.