In the Newsen interview Yoshi confirms he is Zainichi Korean:
(Google translated)
Although Yoshi is from Japan, he recently took and passed the GED. Yoshi said, "I'm a 4th generation Korean-Japanese born in Japan. I got to know it because I really wanted to know a lot of Korean culture. I'm very happy to pass and I'm very grateful to the members who helped me a lot. Thank you very much, too."
But...is he mixed or full?
