This is a good lesson in cultural relativity — in fact, Samsung did a fantastic job designing their emojis! Zara Zhang did a great piece highlighting one of China’s most popular social network’s emojis, WeChat.
It’s true (human) blood is always red, however it’s common to use the color blue to represent blood. It’s possible in Korea red blood has a stronger or more negative connotation, or maybe it has nothing to do with that at all. Either way my guess it was intentional, especially taking into account the great design of the rest of Samsung’s emojis.
I suppose the takeaways here are:
A) We can’t always design for everyone’s understanding of everything everywhere and
B) If a design looks broken that doesn’t mean it is broken, particularly considering cross-cultural nuances.