Everybody, and I mean everybody, knows about the smugglers and the future coming back for the present; everybody that is except the man who created the teleport. Nothing and no one is trustworthy. The level of betrayal within Tae Sul's camp is minding-blowing. I knew Seo Jin was shifty in her feelings; I didn't anticipate her duality. I should've known, though; she's a psychiatrist, after all.
I'm always amazed at the sheer malevolence and utter disregard for Tae Sul that Seo Jin, Eddy, and her father have shown. As they say, the world is not fair, and often fools, cowards, liars, and the selfish hide in high places. Like Tae Sul, I believed his enemies were unknown to him, but this whole time the enemy was hiding in plain sight, a lot closer than he or I ever believed. The enemy within is more dangerous than any foreign entity imagined.
I started to think Tae Sun was a figment of my and Tae Sul's imagination, so it was good to get a real glimpse of him. But what I'm not entirely sure of is whether he is Tae Sun of the future or the present or even the past for that matter. I'm still unsure why the Bureau wants Seo Hae dead if they know they can't really kill her since everything is in a loop, and her death wouldn't change the future unless there is more to the story than we know. But despite both Seo Hae and Hyun-gi knowing nothing they do can change the future, they continue to travel to the present to try and affect change they themselves don't believe will happen. I find that quite interesting.
Control Bureau and Broker Park notwithstanding, Sigma seems to be the most valid threat to Tae Sul but is Seo Jin Sigma, or is there an entity behind her like her father tried to make Tae Sul believe. If I were to guess, I would say Seo Jin is Sigma, and she is willing to do anything and everything to get what she wants to stop the future from catching up to her mother. The lines between the future and the present are starting to get really blurry with Sisyphus. At times I'm not entirely sure if everything we see is part of the present or smugglers from the future. Watch Episode 6 here.