" Excuse me?" Mo Xifeng felt like she had misheard Mo Qiang which was why she asked her sister to repeat the question. Because no matter who the woman was as long as she was called 'flat', it was obvious that she was going to get really angry.
So in this case when Mo Xifeng said, 'Excuse me'.. she wasn't asking Mo Qiang to repeat herself but in fact, she was giving her sister another chance at survival.
However, Mo Qiang might not have the freaking will to live as she not only repeated herself but she also raised her voice thinking that Mo Xifeng did not hear her the first time, " I asked you whether or not you are flat."
Because the costume was a bit too furry, Mo Qiang was having a hard time estimating the correct size of Mo Xifeng but as she thought about it, Mo Qiang realised that Mo Xifeng was indeed quite slender like Mo Yan.
