In thr main story when Fox Jung and Moonkyul had that fight Moonkyul actually syas that the sex he has with the old pedo isn't the same as he has with Fox Jung. I mean the relationship was confirmed in the main story itself.
the hints in the main story are kinda' vague tho i feel that there is really that kind of relationship maybe the author forgot all about this loopholes skssksk anyway
The entire relationship is actually too twisted. Jung and Moonkyul has power imbalance in their relationship and both are not secure enough. I'm not even adding that old pedo into the mix. Even without him in the scene the relationship is something that in future can end up as police case for domestic abuse or something.
I THOUGHT TYE AUTHOR CONFIRMED THAT HE AND THE OLD MAN JUST HAD LIKE ORAL AND NOT THAT UHM WHAT WTF IS THIS