Having watched the original La Casa de Papel, the first episode of this remake already does not give the punch the original has.

1. La Casa de Papel was shot on a low budget. This feels even lower.

2. There's no build up of storyline. The producer probably knew viewers knows the end of the story, so things gets compressed A LOT. We don't get to see how the Professor hit up Lisbon. It JUST happened. Military scene happened way too fast.

3. No originality. Having a remake is not a sin. For a remake to be great there has to be a sort of different story that fits into the cast and producing crew. Venue could be changed to something of cultural impact, much like how La Casa de Papel is based on Spaniards' economy crutch and the anger of government printing money, in real life.
But what the Korean producing cast did was make up a fictional backdrop which folks can't relate to, and to forcefully put in a Mint just so they could copy it.

4. Acting. Berlin, Denver in La Casa de Papel is an outright psycho. Professor is an outright nerd who's like an excited kid. Tokyo makes the viewer mesmerise in her sexiness. Arturo gets people's hate from the very instant.
The acting in this remake made me feel everyone is a gentleman and fine ladies.

5. My Life Is Going On, so Bella Ciao my dear remake.

In short, the remake does not bring viewers into it. Just watch the first episode of La Casa de Papel, the difference is obvious.