Yes, my Korean name is Yong Se-chan.
(Thankfully it's the same, no matter how you romanize it.)
After calling so many Koreans by an English name (far easier for westerners to remember), it's only fitting that I should reveal my Korean name. Most Koreans that I've mentioned this name to seem to think it sounds nice and gives a good impression, which is important.
龍 (용 룡, dragon) Yong, dragon, is fairly rare as a surname in Korea, but it does exist and I have in fact met someone with it. The choice was easy: the flag of Wales has a dragon on it, so...
世 (세상 세, the world)
贊 (도울 찬, help[s])
Because of Korean's subject-object-verb word order, the name in full means "[the/a] dragon [who] helps the world". A reference to my personal philosophy of being nice to others and also to my work as a teacher.
Written in Korean alphabet (han-geul): 용세찬
Written in Chinese characters (hanja): 龍世贊