Given the question: Build a movie plot around this: What are Part and his agents tailing? several patrolling South Korean SWAT officers
The answer is:
In October 1992, an elite group of North Korean soldiers are put through a brutal training regime. Under the auspices of their commander, Park Mu-young (Choi Min-sik), they will be sent into South Korea as sleeper agents, to be reactivated at some later date. The most promising of the group is Lee Bang-hee, a female sniper who assassinates several key South Korean figures over the next six years.Over six years later, in September 1998, South Korea is searching for Bang-hee. The agent in charge of her case, Yu Jong-won (Han Suk-kyu) has nightmares about her murdering both him and his partner, Lee Jang-gil (Song Kang-ho). Yu is also engaged to a young woman, Yi Myung-hyun (Yunjin Kim), a former alcoholic and the owner of a fish and aquarium supply store. Hyun symbolically gives Yu a pair of kissing gourami, a species that cannot live without its mate. Yu is worried that he cannot tell Myung-hyun about the real nature of his job due to his security clearance.Yu and Lee are contacted by an arms dealer who claims to have information about their quarry, but he is shot dead by Bang-hee before he can give them any information. After digging a bit deeper, they determine that he had been contacted by the assassin at some point, in the effort to acquire something. That something turns out to be CTX, a binary liquid explosive developed by the South Korean government. In its ground state, CTX is indistinguishable from water, but when placed under the right temperature conditions for long enough, a 200mL worth of CTX has a 1km blast radius. The agents begin to suspect its intended use by the assassins, when Kim, a scientist working at a lab connected to CTX, is assassinated by Bang-hee.Park and his agents ambush a military convoy with several liters of CTX, killing all the soldiers and making off with the dangerous liquid before the agents could arrive in time to warn them. Yu and Lee suspect a leak, as they are always one step too slow. Hee is ordered to eliminate the 'kissing gourami' obstacle. Yu meets with Police...