나쁨 놈, 허허실실한 척 지독한 건 알아줘야 해. 是什麼意思

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Oh, bad man. You so scheming/conniving as pretending to laugh things off

* 허허실실: (Chinese 4-character idiom) to accept things for what they are, let things be what they used to be, take things as they are

However, the actual usage of 허허실실 is a bit different from its original meaning

허허실실 웃다
허허실실 행동하다
허허실실하게 굴다
->
to pretend as if everything is okay while you hide a plot/ulterior motive/true colors

* (사람이) 지독하다/독하다: 독하다 is basically about how strong something smells or how dangerous a poison is. When it comes to a person, it figuratively describes someone having a weird streak like he is holding poison in his guts. It may sound like being toxic, but 독하다 has a bit of approving of someone while disapproving in the same word