I'm also frustrated about this. People keep being surprised or confused everytime someone mentions information we have all been shown in the prologue. If the prologue wasn't right here in the chapters' list I would understand, but it literally is (twice!).
Of course, the prologue is all over the place and it's unclear if it follows a chronological sequence, like previews usually are, but we are given a lot of information about what is about to happen next, yeah.
I had to re-read the prologue after ch 96. Its clear HeeRyang will know Chang aided Yeonjo's escape and use him to lure him out. My thoughts is Yeonjo will be back with HeeRyang while Chang is in captivity and that's when Silver Haired Dude will know of Yeonjo & HeeRyang's relationship and attempt to persuade Yeonjo then. Idk why its prologues' are always forgotten. I also have a feeling that Yeonjo will likely die.

Why has everyone forgotten about the season 2 prologue so quickly??? It already kind of told us so much lol.
Kwon Hee-ryang clearly gets Yeonjo back by locking up Munyeong (I think that’s the other dude’s name) in that room where Yeonjo used to be locked in. Hee-ryang tells Yeonjo that he will kill Munyeong if he doesn’t stop pulling stunts like that and trying to kill himself (we can see that Yeonjo has short hair here). One night we see a much skinnier Yeonjo goes to sleep with Hee-ryang, I guess he stinks of alcohol because Hee-ryang talks about how much Yeonjo must have drank. Yeonjo basically says why does it matter, sober or not you still want my ass and you’ve said you would fuck my corpse if I starve myself to death.
Now I’m not sure if this is after Yeonjo must have met that silver haired man but yeah thought I’d share what might happen with anyone that cares. This is unless the author decides to change the story last minute ╮( ̄へ ̄)╭