She was laughing at the expense of their gullibility for falling so easily to Yun Ruobing's cheap tricks.
Ruobing misread Xinghe's smile as a scowl and she jubilantly exclaimed, "Xia Xinghe, the feeling hurts, doesn't it? In the end, I win and you lose! I have you beaten!"
She was alluding to the incident that happened a few days ago. To think Xia Xinghe thought she had beaten her by throwing her out of the lab; Ruobing sure showed her! Victory was ultimately hers!
Ruobing was on cloud nine because she didn't expect her chance at revenge would come so soon!
How Xinghe humiliated her then, she was going to return tenfold!
Of course, this was only phase one. Another win would be when she made her grand return to the lab. Of course, she wouldn't hesitate to humiliate Xinghe if she was shameless enough to show up at the lab despite the ban.
