This Korean comic is not right

Zhao Cheng traveled through time and arrived in the Korean country, but the colorful hair and eye colors were completely different from the reality.
Where on earth is this? Is this really still on Earth?
Liu didn't realize until he saw those familiar people and things that this was actually an 18+ Korean comic? And he actually carried a dual cultivation technique with him?!
I can’t even imagine how comfortable life will be in the future.
It was not until the abnormalities gradually appeared that Zhao Cheng realized that there was really something wrong with this Korean comic!