Good sir, I would like to buy this. they're both speaking in formal manner

Certainly not, ma'am.

Please be my guest.

You do me wrong. I must have it. Else I will stay here glued like this.

*Li-

-ft*

C Cut it out~!!! You're just being rude now!!!!!

As are you, bro. '님' is often used to address a strager on internet and because of this is often used to jokingly address friends