Responses
The uke was the only one who thought of the ml as a rival/enemy in highschool: https://www.mangago.zone/read-manga/checkmate_1/
childhood friends to childhood enemies to lovers if that counts
https://www.mangago.zone/read-manga/beauty_and_the_west_chamber/
https://www.mangago.zone/read-manga/sangyang_the_wanderer/
Rec childhood enemies to lovers bl manga