Because they didn't. DM's whole case was built on corporate espionage which never happened.
I know I am talking about the comments in the Livestream, because they were obviously flirting "I found someone to share the rest of my life with "
That makes no sense. Taemoon didn't show up until the very end, and the whole point of of livestream was to clarify that Seonwoo had been fired for doing his job and office corruption, and Mr.Joeng, the nice HR manager, who helped him was being dragged down for no reason. And that DM was disclosing Taemoon's parentage as punishment for helping a fellow colleague, Seonwoo, stand up to the corrupt bosses. And corporate espionage, as DM claimed, was not the issue at all.
Them being a couple didn't even come up until Taemoon showed up towards the end and basically outed himself. So, people who had been tuned in from the start all know why they were fired (both right and wrong reasons) and him and Seonwoo dating is not the issue.
Oh, in case, I wasn't clear (or maybe u didn't get it) the whole argument on Seonwoo's side is that Mr. Joeng is a righteous guy who would helped anyone like he helped Seonwoo because he is a hardworking and responsible guy with integrity. He helped Seonwoo, not because they are dating, but because he can't see a good man getting ruined just for doing his job.
I get all that I am talking about a "red herring?"
Like when people hide important news for example : "the corrupt president of some country wants to establish a dictatorship the military force then takes action but that president escapes to another country"
Then the people from the same political movement not wanting to lose power move a lot of money so the news no longer talk about that but in place they are about "the REAL important news " that is the dead of a really famous singer.
THIS ↓ IS ALL A CONJECTURE I GET THE ACTUAL PLOT
In this case the people watching the Livestream could have thought that besides corruption maybe the company wanted to fire them because they are gay and that is not good in a conservative country but the company couldn't openly use that as an excuse to fire them because that would make them look bad to groups pro LGTB+, and the company luckily had another excuse, the corporate espionage .
Weird no one said that maybe they wanted to fire them for gay and not for spying