Xin Yu thinks that He Lan knows the truth behind the injustice she faced. He Lan interpreted her action as her accusing He Lan of being the mastermind. He Lan throws a teacup to the floor. Xin Yu was hurt while trying to pick up the glass shards. At that exact moment, Cheng Feng came in and tended to her wound. He Lan uses that as evidence to prove that they have an unusual relationship. (Source: Viu)