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Well he could and that might be how the author would intend for him to find out. However, I don't think the servant is going to do that. I imagine servants in Yoon's house have learned to not spread the wrong kind of rumors. After all, he was the sole witness. If it gets out, Yoon will know that servant did it.
If there were more witnesses he might be okay to gossip, but not when he's the only one who saw. Too risky. I'm sure later in the plot he'll spill the beans. Just not right away.

Hey, your theory's great !!! I was so happy to read it, cause I would do anything to know what's coming next :-))))))))) I'm totally addicted...Thank you !!!
What about Jihwa ? I'm not sure he will find out that master Yoon had sex with the painter, cause he already knows that master Yoon lusts for the painter, and had already gone mad. By the way he is such a beauty ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄ Sometimes I don't understand why Master Yoon wants the painter so badly, when he can have Jihwa.
One thing I'm pretty sure : there won't be an happy end for all of them

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Jihwa is highly erratic and emotional. He is guaranteed to do something rash and stupid. He is also possessive and jealous. Hell hath no fury like a Jihwa spurned.
Unfortunately, Jihwa is not clever or cunning. I mean his big plan to take down the painter before was "pour water on the painting". The only reason it almost worked was because of what the Painter said at that moment. Otherwise, it would have failed. Jihwa got lucky.
He had a spy on Yoon's estate which is a huge insult. While it's probably common, if you get caught the lord gonna be pissed.
Yoon didn't seem to concerned if word got out he was sleeping with a commoner. Probably because even the nobles who are straight sleep with consorts and women of the night. It might cause a stir among the nobles who sleep with Yoon because they don't want to share him with a lowborn, but it'll hardly be a bigger scandal than his love of sodomy and orgies.
Now if Yoon ever tried to marry a lowborn, that would be a real scandal. But it was common for men in the nobility (in any society) to have mistresses or consorts that were from the lower class. As long as it was just sex, everyone looked the other way.
Oh the lord is banging a lowborn? Well, as long as he doesn't marry the lowborn we will all just pretend not to see it.
The Painter is the one in real trouble. The more attached Yoon gets to him, the more trapped he'll be. Even if he tried to run away, Yoon has his beloved teacher. The Painter would never abandon the teacher.

Pretty accurate, in case Nakyum wakes up and remember everything.
He might wonder if all this wasn't a dream, will feel the pain in his inner part and also may see some liquid coming out of it, haha. When he'll be certain he has slept with his Sir, yeah he will go to confirm it, but then knowing In Hun, he'll only get crushed in pièces.
Now, not only he does these "filthy paintings" of sodomy for that frivolous Master, but he's also selling his body to him! (We can already enseen the haughty, glare of despise of the teacher on Nakyum, to show how he disapprouve their debauchery.

... How he's disappointed in NK (he will insist on that point), ans NK will cry, as always...
Now, about Jihwa, how he will find out that Nakyum has slept with the Lord/or Lord has slept with the low born... Well, I think in their attitude. Especially Nakyum cause he's so transparent.
Following their night of sekse, Yoon may simply stops to sleep with the nobles, or if he does, may be absent-minded. Seungho will become more and more obssessed with the painter, and he may not even hide they slept together.
Jihwa who have seen all this from aside, had made plan to avenge his honor and the honoraires of the other nobles the fucking buddies of Yoon by eliminating the liw-born!
In all case, Nakyum will live in that house at his risks and perils.
I seriously hope he'll get some charaster développement, because till then he was always crying. It can get ennoying sometimes... We get he's young, naive and low-born, but he's also a man. I don't know for other but I'll get bord if all he can do is to trust blindly in that hypocrite teacher and crying face to all that dangers. I'd like to see him becoming stronger, even though the charm of this Yaoi lies also in thé fact he's so vulnerable...

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I do hope in the end that Yoon might actually support the Painter getting real training in his art. Of course, that would be in the case that Yoon catches the feels and sees the Painter as more than just his property.
The Painter is an incredibly gifted artist. He could be so much more than a crying uke. It would be amazing if the Painter achieved what the Learned Sir could not and actually became successful as an artist recognized for his talents.
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I think the Painter will wake up the next morning alone. He'll believe it was the teacher and go to confirm only to be ruthlessly shot down by the teacher. This will make him feel like crap.
Then he'll encounter Yoon who will ask how he's doing and then whisper in his ear something like, "You were so wild last night."
Painter will pale and realize that it was Yoon he slept with, not the teacher. When he tries to accuse Yoon of taking advantage, Yoon will act like he had no idea the kid mistook him for someone else.
"You came onto me, remember? I thought you wanted it. You kissed me and begged for it."
Since the Painter was drunk he'll not remember clearly if he did make it clear it was the Learned Sir or not. He'll believe that maybe Yoon thought it was him the Painter wanted. The Painter will wonder, "Did I call out to the Learned Sir or not? Maybe Yoon thought it was him I wanted. Oh no! What do I do?"
Yoon can play dumb.
The Painter can't admit that he thought Yoon was the teacher so he may go along with the lie because he doesn't want to tell Yoon, "I thought you were my teacher."
Yoon of course knows this, but can easily act like he didn't. This can also make him pressure the kid for more sex by saying, "I had no idea you liked me so much. We must do it again. Who am I to deny your lust?"
Of course, the Painter will be mortified by this suggestion and try to get out of it. He'll also remember how he felt and that deep down he enjoyed it which will horrify him even more. He wanted the teacher, not Yoon.
Yoon will increasingly hate that the Painter wants the teacher. Yoon has everything the teacher wants and the teacher has the heart of the one person Yoon will increasingly want.