Die Hard references:
1. The title Chu Hard is formatted in a similar font as Die Hard.
2. The terrorists hold hostage a group of rats playing. In the movie, the terrorists hold hostage a group of people at a company Christmas party.
3. One of the terrorists is a computer hacker trying to unlock a safe.
4. Gan-chan jumps off the roof, bounces off a tree, and breaks through a paper wall. In Die Hard, John McClaine jumped off the roof and crashed through a window.
5. Gan-chan hides out and is on the defensive while the other terrorists look for him.