Fantasy

In another world, I snagged a wicked skill.
    A skill that lets me copy someone's powers and looks by drinking their blood.
    Sounds like an ultimate cheat, right? But there's a catch: it's worthless unless I can actually draw blood from them.
    And somehow, after a helluva struggle, I even managed to slurp up the Demon Lord's blood!
    Thought I was set for an epic cheat life in another world!
    But then, bam, back to Korea.
    Except...why are there monsters here too?