If you like her, be fair in trying to win her over and don't use your tears !!

She isn't "using" her tears, she's crying, because she's heartbroken and desperate.

It's the same thing in the end right? She's crying because she knows that the person she loves is slowly slipping from her reach. And I find that unfair because she did nothing to win her over at first, she took her for grunted. AND NOW that Qui Tong is triying to be in a relationship with Sun Jing, she's crying, and because she's crying Sun Jing wouldn't be able to go see Qui Tong at the school's gates !!!!! And am sur that there will be other situations like this one. AND THIS FACT IS DRIVING ME CRAZY !!!! That's why I don't like characters like her, you're too late girl, don't ruin others relationships.
That's all I had to say.
Of course, because am a hypocrite, if I like a guy, I would do anything to have him, but NOT if he has a girlfriend.
That's all I had to say

It's not the same thing, because you don't choose to cry. She isn't -using- her tears, she isn't using anything, because she isn't making conscious decisions right now. She's having a breakdown because she can't control her feelings and she doesn't know what to do. I don't know if you just aren't familiar with how it feels to not be in control of your feelings, or if you're just lacking empathy here, but Mo hasn't done anything wrong. All she's doing is expressing her feelings honestly. She has been trying to express her feelings to Sun Jing basically since we first met her, and Sun Jing has been continuously oblivious and dismissive. Her behavior at the party was especially cruel.

That doesn't mean SJ has really done anything wrong, either. Being cruel to someone by accident is a mistake, not a sin, but it does mean she kind of owes it to Xiaonan to hear her out and answer her feelings with an honest rejection.