This is one of those random topics I thought people might enjoy reading about.  Names for Korean days of the week are same are Japan.  I don't know who copied who, but I doubt it was copied from China because China uses different names for days of the week.  Meaning of the names translates perfectly to Western names for days of the week which supposedly originated from the Babylonians.

Monday is Wol-Yo-Yil.  Wol means moon.  Yo-Yil means day of week.  Eveyone knows that Monday means Day of the Moon, right?

Tuesday is Hwa-Yo-Yil.  Hwa means fire.  In Korea, planet Mars is named Hwa–Sung where Sung means Star.  Tuesday also means Day of Mars in the West.  I don't know which came first, but I am pretty sure one of the two, names for days of the week and names for the planets, came first.

Wednesday is Soo-Yo-Yil.  Soo means water.  Since Mercury is named Soo-Sung and Wednesday means Day of Mercury in the West, we have another match.

Thursday is Mok-Yo-Yil.  Mok means wood.  Jupiter is named Mok-Sung in Korea so Jupiter part matches.

Friday is Goom-Yo-Yil.  Goom means gold or metal.  Venus is named Goom-Sung, again matching Friday as Day of Venus.

Saturday is TTO-Yo-Yil.  TTO means earth.  By now, you should be able to guess that Saturn is named TTO-Sung in Korea.

Sunday is Yil-Yo-Yil.  Yil character means day or sun.

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