Decent film but has a huge plothole (spoiler)
So they have placed heat-detonating explosives next to industrial sized light bulbs in a stadium above government officials they want dead. The heat from the bulbs activates a timer. Now when they manage to shut off the light bulbs with just 5 seconds to spare the countdown stops. Major plot-hole here. Everyone knows that when you turn off a light bulb it doesn't cool down immediately. Especially not within a matter of just 5 seconds.
It would have been more feasible and created more tension if they had cut off the lights with like 1 minute to spare but the heat from the lights kept the countdown running until there's just a few seconds to go and then cooled down enough to stop.
This was a decent film, not bad but not really great either. Just below good.
If you wanna see what this director can really do watch Tae Guk Gi.