Sandra's real goal was for Wilson to witness this scene. She wanted Wilson to accuse her once again!
Why? Why did Sandra have to go this far? Clara already backed down again and again. She couldn't believe a human being could be this malicious.
Even though Sandra would be marrying Wilson soon, she still wanted to frame Clara.
But Wilson despised Clara, so what's the point?
Was she afraid that Wilson might fall in love with Clara again? The thought made Clara laugh because it was so ridiculou