That day, Su Hui had requested a day off and specifically went to spend time with a college friend who had recently graduated from the police academy; the two met for afternoon tea at a restaurant.
Since it had been a long time, the two chatted on length. In their line of work, once the conversation turned to work-related matters, such as what cases they were currently handling, it was really hard to stop because there was just too much to talk about.
Her college friend mentioned a case she had just handled, where an elderly couple reported their son missing. Upon investigation, it turned out that their son had taken the wrong path and joined a gang. Because his parents disapproved, he had cut off all contact with them after joining the gang, which left his parents with no choice but to report him missing.