The police officers knew Yu Qi personally because Yu Qi cooperated with them in a mission to save the victims of human trafficking. There was no way that Yu Qi did that to them without any reason.
With the hotel manager telling his side of the story, it was possible that Yi Dang Kui and his family came with the intention of ruining the wedding. So, the police officers ignored Yi Dang Kui's complaint. They told Yi Dang Kui that he could make a report about this matter himself at the station if he wanted.
As for the call which had been made by the stranger, the police officers would concluded it was just a misunderstanding of that person.
Yi Dang Kui needed to lift her wife and daughter into the car and drive back home. He drove about 4 hours to FINN City after knowing that Ding Na An got married today. But he gained nothing from this.
