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This is from S-Ranks wiki
""Seseong" is one of the Korean names for the planet Jupiter, though it is more often called 목성, mokseong. This name may be a pun: Jupiter is named after the Roman god who controls lightning, which is one of Sung Hyunjae's most distinctive skills. It might also be a pun on 세상, sesang, lit. "world" combined with his surname, Seong."
Can anyone with better korean knowledge than mine explain why sesung /seseong guild sometimes gets translated to jupiter guild? I was sure that I learned a different word for jupiter and even looked it up again but only found "목성". Is there a different meaning or spelling I don't know about?