I’ve been living in Seoul, South Korea, over two years now but I only this last year found a heat protecting spray here. The Korean heat protectant spray is from Mise en scène and istället “Mise en scène Frizz Control Damage Care Essence” and contains Argan oil and camellia. Even on the back of the bottle not specifies that it does work for heat protecting. See pictures below. The product wasn’t expensive, I think I paid 7000-10 000₩ for it. I definitely recommend you try it if you, like me, use hair straighteners or curlers and hair dryers for fixing your hair.