It is a razzle watermelon. I really like how they are made. They take the pre matture 수박, 수 박 and put it in a glass box and wait for a long time and replace the box when the 수박, 수 박 can't fit in it anymore
Lol, I remember 읽기 something about these last year. I think it was first grown in China, and they put them in boxes of some kind to make them grow into that shape.