Spoiler!
I used a translator but Yu tong notices that Weiyun lookes diffrent compared to his other confesstions, so he thinks that Weiyun liked the girl and leaves with his friend left to witness the confession, but Weiyun actually rejects the girl and says that he loves someone else which Yu tongs friend heard, the girl promised not to tell anyone and was accepting, when he turns around to try to tell Yu tong he already left, sorry my English isn't that good