Both twins are tall, Yejun is more serious, sarcastic and mocking. While Jiho is sweet and dramatic, although he is also mocking and sarcastic.They are sadistic, obsessed with humans called "pufferfish." At first they seem sweet...but they are really cruel and unfeeling people. They don't feel love. For them, people who release these types of toxins are "drugs." This is based on dolphin science with puffer fish.