Listen if this plays out like that I'll cry...
ok then I'll wait until season 6.
If I hadn't read the prologue for this season I would absolutely agree with you!
Wait there was one I missed it ... Going to find it to smooth my soul
No! Don't go read it if you haven't yet! I think it will not sooth your soul at all...
To all of you thinking he already figured out the situation I say not so fast guys! Remember, the terrible abuse area described by the author has finally came to an end when Yeonjo escaped. That means whatever happens in between that and the coming redemption arc will certainly be some circumstances that will prepare the seme to beg on his knees for Yeonjo's pardon (according to the author).
Seme may be doubtful about the true identity of the corpse since he's way too sharp. Or maybe he did figure out the truth but that guy who helped Yeonjo escpape will tell him next chapter that he indeed helped him escape and that Yeonjo is in love with the seme and that's why he attempted s**cide.
The seme went full mode psycho on Yeonjo because he thought Yeonjo hated him all this time and had no feelings whatsoever. If he learns by that guy that Yeonjo actually loved him he may recover his senses and maybe this time he will do the right thing and let him escpae and live his life.
I am pretty sure there will be a time lapse before they meet again...