answered:
She casually raises her left eyebrow and ask in a monotone, “Why should I? Why so demanding?”
"Ah, is that so?" He looks at the other, contemplating on something in his mind before saying, "Should I call you ‘Noona’ then, Minzy-ssi?"
"No, not at all." She said, trying to hold her laugh. "I’m guessing you didn’t get the sarcasm there, Sehun-ssi."
He looks at the other, his eyebrows raising slightly. “You were being sarcastic? I didn’t notice.”
She snorts again at the boy. “Obviously, I’m good at it."