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Besides the language skill, how much is he still a Korean? I think his stomach is more than 50% Korean. I don't know what he eats every day. But from what I've seen online and from the fact that he is running a Pan-Pacific restaurant, I think he eats Asian foods more than non-Asian foods. I may be wrong here. But I think his meal comes with a bowl of rice most of the time which is the case for me.
Now, how about non-Asian side of Sung? Hard to say since I don't really know him in person. But I think he does not smoke is a good example of not being a typical Korean. Of course, not 100% of Korean guys are smokers. But the stereotype image of Korean ajussi, which means over middle age male in Korean, is a heavy smoker.
After all, one thing I feel he is really really Korean is, of course, his appearance. He is 100% Korean in his blood wise. His Korean feature is getting stronger as he aged. In some of his pictures I can see online, he is just like any other Korean ajussi. I should call him ajussi next time I see him in person. I can tell he is Korean by looking at his eyebrows and lower jar line. That's how we typically discern Koreans from Chinese or Japanese.
I do have a plan to go to LA next Friday. Well, just as my flight connection place. I won't go outside of LAX. Obviously, I don't get a chance to visit his restaurant this time. :( It's my business trip to Phoenix. I'm connecting my flight at LAX around 8pm on Friday, and I only have a little over an hour there.
One last thought. I wonder which country's team Sung is cheering during this Worldcup. South Korea, USA, or maybe North Korea? :D