When Fang Xing tried to persuade Ying Qiaoqiao to let go of her hatred, he was being uncommonly genuine. He wasn't the kind of person to leave behind small problems so they could grow bigger later, and when he heard how strongly Ying Qiaoqiao hated him, he nearly decided to "accidentally" throw her over the side of the ship. He quickly thought better of it, however; he still needed this girl in order to sneak into the Melodic Ice Palace, and her father was already one of his people. It was best to just convince her to let go of this hatred.
As for Ying Qiaoqiao, when she heard "let go of your hatred", her stomach began to bubble with fury and her responding "why?" was filled with anger. But when she heard Fang Xing's follow-up about how her life would be filled with even more sadness, her entire body froze and she subconsciously muttered, "That little devil has made my life so miserable already; how could I become any sadder?"
