Skylark got pulled for a few tables and decided he was going to cheat to the best of his ability. He went for dealer training because he knew he'd suck as a bouncer, and already had experience cheating at gambling games even before that, so he's already familiar with many of the tricks and mostly just had to learn the rules.

He'd be using his apparent age and mild first impression to see which patrons will let their guard down or underestimate him, and lets them win a round or two first before he starts cheating in earnest to try and keep them playing. He's naturally very dextrous (and thus good at sleight of hand), will be putting on his best friendly poker face, and overall good at reading people.

Notably, he will try to dodge being a cho-han dealer because he's not gonna go shirtless, but he's perfectly fine with any of the other games.

Afterward, when he's done his time at the tables he'll go melt somewhere for a bit. Keeping up the customer service face is hard work.