This is so unnecessary and devoid of a plot. I give this alternative S2 script free to Netflix:
During WW2, Japanese has a biological weapons and biological warfare program (Unit 731). The US brought those Japanese researchers who also conducted immensely sick and cruel human experiments to the US after the war ended. Just like they brought the German counterparts to the US in Operation Paperclip. Their research continued in the US on the coast of Connecticut at Plum Island. The US government had a secret program in the 1950s and 1960s to experiment on weaponizing ticks to deliver deadly bacteria to incapacitate unsuspecting populations. It is possible (& perhaps likely, though not proven) that the emergence and spread of Lyme disease may have been caused by this research program, which included large open-air testing of intentionally infected ticks on US soil. It's well known to people in the Lyme area that the disease likely came from Plum Island, and it's been known for decades. Some experimental mutation animals (like half pig half dog) were discovered on the beach by local fishermen. It was common for deer to swim from Old Lyme to Plum Island, and that the government attempted to shoot any deer that swam from Plum Island. The mutants got away from the Lab 257 at Plum Island and there we have the alternative scenario for a thriller based on real historical events like S1. (see eg. YT: The Whyfiles: The Horrors of Plum Island: Hybrids, Human Experiments, and Weaponized Killer Insects; or the book: Lab 257)
For some 10 mins I was sure Dan Ho would say he can't be with Mo Eum bc he's gay. In fact that would have made more sense than this "I can't be with you - I want to be with you" behavior. I really don't dig the 2nd couple story arc, the parents' relationships are more fun.
ML looks exactly like Bae in Hyuk (and looks like he's portraying just as dry a persona as BIH in most of his roles). Rooting for 2ML Hong Jong Hyun and watching bc Lee Se Young -- although I ended up hating Park's Marriage Contract. This is only 6 eps, otherwise I'd drop after the first episode.
A very good noir crime / police drama. Not too violent or too gritty, although it touches dark themes. The police team's friendship is close to the "found family" trope, which I like always. The villains in this drama are not painted as purely bad characters, which I also appreciated. I almost wanted the main villain to be able to escape, bc we could always see the abused child in his eyes. The only thing I didn't like was the romance side plot, it was cringey. However, that didn't take too much time. The whole story arc was very logical and well written from start to finish.
Great start. Liking this a lot. Solid writing. Great acting. Ticklish funny. Perfect fit with my sense of humour. Just wish Kang San Jun was the ML. Him laughing his a** off at Eun Ho at the beach just to mislead, that was great.
K-Drama 
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During WW2, Japanese has a biological weapons and biological warfare program (Unit 731). The US brought those Japanese researchers who also conducted immensely sick and cruel human experiments to the US after the war ended. Just like they brought the German counterparts to the US in Operation Paperclip. Their research continued in the US on the coast of Connecticut at Plum Island. The US government had a secret program in the 1950s and 1960s to experiment on weaponizing ticks to deliver deadly bacteria to incapacitate unsuspecting populations. It is possible (& perhaps likely, though not proven) that the emergence and spread of Lyme disease may have been caused by this research program, which included large open-air testing of intentionally infected ticks on US soil. It's well known to people in the Lyme area that the disease likely came from Plum Island, and it's been known for decades. Some experimental mutation animals (like half pig half dog) were discovered on the beach by local fishermen. It was common for deer to swim from Old Lyme to Plum Island, and that the government attempted to shoot any deer that swam from Plum Island. The mutants got away from the Lab 257 at Plum Island and there we have the alternative scenario for a thriller based on real historical events like S1. (see eg. YT: The Whyfiles: The Horrors of Plum Island: Hybrids, Human Experiments, and Weaponized Killer Insects; or the book: Lab 257)