its kinda hard to find ones where the bl is just a hint ngl i think novels are more plot focused but i feel like there are a lot of isekai webtoons where bromance is prominent with the rival
https://www.mangago.zone/read-manga/mo_dao_zu_shi_novel/
https://www.mangago.zone/read-manga/heaven_official_s_blessing/
https://www.mangago.zone/read-manga/global_examination/
https://www.mangago.zone/read-manga/turning/
https://www.mangago.zone/read-manga/sun_kindergarten_classmates/ (this is not really a fit but the worldbuilding is so cool had to rec)
Sunnyside Daycare Classmates
https://www.mangago.zone/read-manga/sun_kindergarten_classmates/
there's action but bl is more than just hint
PLS PLS PLS rec me a shounen ai/bl webtoon BUT they are an action webtoon. You know the typical game/survival/sword era/material arts but with a hint of BL. I would appreciate it so sooooo much if u can rec me one.