A Modern Man Who Transmigrated Into the Murim World - Ch. 32

[MangaDex]

 

[YouSuckDiddleyUck]

"...that's your mother." Had to lol.
So, I don't want to be unappreciative of the tl group, but I don't understand why they leave certain words alone.
From the tone, I can infer it's something negative, but wtf is a Heukcheonryeon and why isn't it in English?

 

[ItchyBombastic]

THY MOTHER