Based on and influenced by the Taiwanese drama Black and White (which is really good btw, I recommend it).

Sohyun, along with a handful of Korean investigators, have transferred over to a special Task Force unit in Hong Kong to continue the chase and capture of the notorious crime lord and terrorist that goes by the name of Hwanggu. The outlaw on the run is now conducting his illegal activities in Hong Kong after he’s been literally getting away with everything in Korea for over a decade. Sohyun, whom is very familiar with the case, will stop at nothing to track him down after he caused the death to a family member. Although steered by vengeance, Sohyun is very by-the-book and shows no empathy for both criminals and victims, detaching herself coldly and emotionless from her peers.

Jackson, who just came off suspension due to his out-of-whack behavior, is assigned to the Hwanggu case as well and finds himself bumping heads with Sohyun quite often. He’s restless and hot-headed, but very quick on his feet and one of the best case solvers in the unit. During their mission to stop Hwanggu from performing his most insidious plans against the country, Sohyun and Jackson will find that although opposite, they are bound together by fate, but fate isn’t always a good thing.