hello

I also would love to know

I think you can find it on S2 but it's gonna have really crappy quality

English: https://s2manga.com/manga/my-sister-picked-up-the-male-lead/

Spanish: https://lectortmo.com/library/manhwa/52724/mi-hermana-recogio-al-protagonista-masculino

Arabic: https://mangalek.com/manga/my-sister-picked-up-the-male-lead/

Most of the other English websites uses S2 manga translations, so there's not really much difference if you read at their official page.

Thank youuu~ ♡♡♡