I started typing this in response to someone's comment and realized that it's not as simple as I thought lol. Please comment if I'm wrong somewhere 

Since i can never remember dates, i just divide them as

1. Before Juwon and Dooshik Met

the murder of spies incident 

meanwhile the whole Juwon gangwar stuff, Juwon joins the ANSP

2. Before Dooshik's First Disappearance

JW-DS partnership assignments > DS and MH romance > DS goes MIA in NK

3. Before Dooshik's Second Disappearance 

DS returns > exposes Yongjun's crimes and sticks him into a tree near the Blue House > ANSP shut down, NIA restructure > DS disappears

4. Before DS' Final Disappearance

DS and MH go into hiding > marry and have Bongseok > DS caught, MH a d BS escape 

 meanwhile JW finds Jihee, marry > Min Yongjun recalls Juwon > Juwon vs. Sniffy Man vs. NK Superpower Guy > Huisoo born sometime around here > Min Yongjun restarts ANSP and recruits Juwon as leader > Jihee dies

5. Present Timeline

starting from MH setting up donkatsu place