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I had a feeling that the lady in the last panel is Nakyum's sister from the kisaeng(?). If you try to re-read Ch 46 you can see his "Noona" wearing the same outfit as the lady. Also, if Nakyum came from a noble family (which is possible) but from what we all know, he was abandoned since he was a baby. How can his parents/family knew that he became a painter? The lady may looked like an upperclass because kisaeng(?) wore fancy (not quiet sure of the term) clothes and make up to entertain upperclass men.
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Why do i feel like Mister Kim (seungho's servant) knew something?
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No, he remembered that the doctor came to talk to him while looking pretty anxious. But he ended up not telling anything. So servant Kim probably decided to go and pressure him to talk. That's why he left so late and surprised the servant ladies. The doctor most likely saw or heard something. SH also noticed the dark marks on NK wrist. He ignored them out of anger but when Kim will come back with part of the truth he will confront NK with it and will finally understand that it all makes sense! AMEN. I just hope it won't take 10 more chapters to see that happening.
Jung Inhun looked fine in this chapter. I kinda want to see him more in this story, i also want to give his character a chance (just like seungho). I dislike his actions at first but upon seeing some of the chapters of him and nakyum (when he was child) I just thought that maybe he was sincere back then. Just my opinion.