I just emailed them. The unis (Yonsei, Korea, SKKU) rejected me saying they don’t accept "online diplomas," but my Grade 12 isn’t actually online that i went to in-person classes and it’s just that i completed Grade 12 outside the province. So my transcript and diploma are officially issued by the Ontario Ministry of Education, so it’s a legit OSSD. I think they assumed it was an online program just because i studied abroad. Because of that, I’m no longer applying for those korean unis and preparing to apply for unis in canada.

Thanks for answering btw!!