Well, since I can't really sleep I'm going to attempt to translate the rest of the dialogue from their after math scene. From the sad instrumental background to MM crying and JN subconsciously feeling bad for what happened, here's the dialogue.
He wakes up to see her crying by the bed. Right before he could say anything, she said, "'My duty is now complete." Duty in this case refers to them sleeping together.
After he heard that, he was sad, almost startled that she would say that.
MM: "Was (my duty) good and worth it?"
MM: "That you will have mercy on my request?"
JN: "Manmueng" --he utters her name in sadness.
JN: "I did not mean it"
JN: "I did not mean to do from what I said."
JN: "Please forgive me?"
MM: "You did not do anything wrong"
MM: "I am yours"
JN: "Manmueng"
JN: "I want tomorrow to be a new day for us when we wake up." -- I couldn't capture the last phrase to upload, but this pretty much sums up their night when he asks them to go back to sleep.
~~~
To be continued with ep.4!