AnkitS

Read the 2nd paragraph

https://kisskh.at/723885-the-worst-evil#comment-15009117

Would you be ok getting back with a partner with you constantly thinking " to what lengths did she go for the investigation" "Did they sleep together?" "Why is she still wearing the necklace" "Does she still have feelings for her past love"
"What has become of my loving husband" " Where is the person I knew"

Joon Mo literally killed Ki Chul so that Euijung won't have to feel any more guilt about him shooting himself over her betrayal. They couldn't stay together as everytime Euijung sees Joon Mo she will remember the moment he shot Ki Chul.

They changed too much during the whole investigation process to be together

The reason for that was the last few conversations they had which made him feel guilty

She must still have it as it was his last gift to her

Hwang Min Gu's death was the most satisfying part.

The last episode was more about the psychological aspect, the character dynamics so the ending was justified, Joon Mo's conversations with Ki chul and Bibi made him feel guilt because he got too attached to them, Bibi killing the cop even after finding out the truth because Joon Mo indirectly told her to hide which shows he actually cared for her, him shooting Ki Chul so that Euijung won't have to feel guilty about Ki Chul shooting himself, and the couple separating because they knew they can't go back to what they used to be. Joon Mo visiting Ki Chul's resting place at the end.At the end the show was about Human greed and the lengths people go to just to achieve their goals. And loose something in the process.Everyone lost something. The end wasn't underwhelming but 'real'.

We still haven't been shown the promotion scene from the trailer. So there are two possible endings if we consider that scene..
The possibility of Joon Mo dying is pretty low.... the story showed us how he changed over the course of the mission so him dying after changing so much wouldn't fit well with him dying at the end.
1. The mission was a success and both of them got promoted but their relationship isn't what it used to be.
2. One of them died (the couple) and the other one is imagining their presence in that scene.

It's not for the faint hearted but you'll definitely regret not watching it...
Ji Chang Wook here is a menace...

Could you guys report this guy, he has been gaslighting people into not watching the drama because he's unhappy with some scenes
https://kisskh.at/723885-the-worst-evil#comment-14939903

Dude you're clearly unhappy with your life and are just here vent your frustration..

If his boss were to do something and make him back off, the sudden change in his behaviour after everything he did to get them would cause Ki Chul to doubt Joon Mo

I didn't see that... Apologies

Yeah, whatever gets you through the night.
Plus if you don't like the drama just stop watching no one's forcing you.

No it's just that you are really bad at English

That definitely wasn't romance, they were both uncomfortable and not actually enjoying themselves. The characters in the drama have complex morality they can't be all good or evil. They are walking the grey line and have to be willing to get their hands dirty if need be.
I have already mentioned this a few times in the comments.... " The Worst of Evil" here mean the characters making decisions solely for their own benefit to accomplish their goals, without the thought of it being morally correct.
This title suggests the lengths people will go to achieve their goals and the evil that is brought out in the process.

Example: Eui Jung's confession to Jung Ki Chul or Junmo leaving the guy to die in episode 7..

You shouldn't be here if you don't like the drama just go and watch your Hollywood dramas... Stop gaslighting others.

Could you write in human speech hardly anything is understandable...

It's the 90's they could get away with that, there were hardly any repercussions.

I think the romantic scenes were much needed for us to get to know the characters better and what motivates them to do what they are doing.

The scene were Joon mo proposes to Eui Jung shows us he has an innocence to him which we were unaware of.

His journey from that innocent man so in love with his to be wife.... to the ruthless and menacing guy who would cut, stab and bite ears off of people and his wife witnessing the change in him and what has become of him due to his mission could only be shown through those miniscule romantic scenes.

These scenes add depth to the characters otherwise they would just be sociopaths who are just willing to do anything for the job.