Responses
Made the search for you ( ╹▽╹ )7
The chapter 76 of the novel corresponds to the end of chapter 37 and the start if the 38 for the manhwa.
But so you know, the adaptation is not a full match 1/1 of the original material. Actions and dialogues may vary. And some of the hidden motivations of Ian are really obvious, when the manhwa try to keep the secret as much as possible.

The Taming has the most messed up "servant who looks exactly like his master" trope and I'm here for it: https://borntobenovel.com/novel/the-taming