1. https://www.mangago.me/read-manga/rebirth_1/
2. https://www.mangago.me/read-manga/the_fallen_duke_the_knight_who_hated_him/
3. https://www.mangago.me/read-manga/two_empires_the_slave_of_the_empire/
4. https://www.mangago.me/read-manga/eternal_covenant/
5. https://www.mangago.me/read-manga/again_1/
6. https://www.mangago.me/read-manga/the_tyrant_s_reign/
Um..
https://www.mangago.me/home/mangalist/2541243/
Maybe ull find something here
Any BL with regression/going back to the past??