When I first saw this in Korea, I thought
It’s kind of cute but it does not look comfortable…
Don’t worry you do not have to go to Korea to get this. I found this in North America. It’s a different company but American Hot Flops 
I do not know who started first ?
I am full of curiosity and love travelling. My adventures started from 9 years old and I have travelled to 57 countries on 5 continents. I have been a Travel Consultant for 19 years and specialize in adventure travel. Destination Specialities: Worldwide focus on Africa, Asia especially Nepal and Japan, South America and Antarctica. Hiking and Cycling tours. I’d love to help you find the right trip and plan your life changing travel! Contact me !