The baddie resorts to murder a boy in Phillipines. He is running an online casino and further joins hands with another casino owner to target the rivals and create a monopoly of sorts. When the baddie is not given what he is owed, he decides to travel all the way to Seoul to make a brutal point. To his bad luck, Detective Ma Seok-do is teaming with the cyber crime team to take on the online gambling ring. How does the detective punches his way to the villain and get justice to the murdered boy, forms rest of the story.
The Roundup franchise by now has nothing new in terms of the story or even the action scenes. It relies heavily on it's main star and his punches followed up by a couple of comic moments. The fourth installment gets in the older films references and tries to introduce a brute villain but he is still no match to our hero. It is not surprising that the non-action scenes soon get tiring and honestly, I kept waiting for Don Lee to punch as many guys he can until the face off the villain - both the times. I am still going with a lenient rating because Don Lee's punches are still that good. If only, they truly value it enough to lend a good script to back the lead hero. If there is a fifth film, I just hope they work on the antagonist more and not just make him stylishly violent.