Sometimes you just need to turn your brain off and watch something silly. This is a movie for that. Played for laughs throughout, with fourth-wall-breaking and a totally predictable twist, it's nonetheless an entertaining watch.
We follow a band of Taiwanese thieves, who rob a bank, only to find they've been set up by the bank's crooked owner, who's hoping to catch them, hand them in as scapegoats, and pocket his bank's cash. So the "bros" (as the English subtitles infuriatingly call them throughout) make a plan to return the cash, and expose the corrupt bank owner. While all the time discovering that you can achieve anything if you work as a team with your friends. Aww.
Along the way, we learn more about the characters on the crew, including the heartthrob lead and his ex-girlfriend; the brooding samurai (whose "no homo" love triangle with the lead is probably the film's lowest point, haven't we got past treating LGBT+ characters as punch lines by now?); the wise-cracking cyber hacker looking for love; and the family man who's just doing this to look after his kids.
There are plot holes big enough to fit a bank vault of cash through, and some Mission Impossible style face-cloning technology which is clearly not meant to be realistic, but the dialogue zips along nicely, I had a few actual laugh out loud moments, and it passed the time nicely.
If you like the comedy style of this, you might also want to check out similar Korean comedy/dramas on Netflix, like Mystical Pop-up Bar.