Sunsu is Korean for someone who is extremely good at something, example: baseball sunsu (pro baseball player). It also means "player." A person named Sun Su is someone who is deeply insightful, intelligent, and skilled at whatever they set their mind to. They are kind, loyal, and thoughtful and are very good-looking like a young Keanu Reeves.
Sun su is so good at that game that he is a video game sunsu.
Oo-seung means "victory" in Korean. The 2nd syllable is pronounced lower than "sung" but non-Koreans won't get it. Ooseung means an amazing person who is focused, stoic, smart, beautiful, competitive, and graceful. She is an icon in whatever she does. She also likes cats and watching old sitcoms.
There is no try. There is only Ooseung or nothing.