Wait i’m confused, what do you mean for “love island”??
it's a dating show
I guess this GL kind of fits, the MC and FL participate in a dating show that later takes place on an island:
https://www.mangago.zone/read-manga/i_was_forced_to_love_by_my_stepmother/ (diabolical name, I know; from chapter 12 onwards is when they're on an island)
helpp ig ill check it out of curiousity
im curious is there any bl/gl manhwa/gas that have a love island concept?