On Valentine's Day, the streets of city X were filled with a sweet atmosphere. Couples walked hand in hand on the streets, enjoying the happy time belonging only between them. The number of Diamond Club guests was several times higher than usual. Kristi was busy for a whole day, unable to even drink. Just when she delivered another box of wine, ready to take a break in the break room, the phone in her pocket suddenly rang. A text message beating on the screen, the sender was Salina. Kristi hadn’t contacted Salina for a while since the last time she borrowed money. Why did Salina suddenly text her? Kristi checked it suspiciously, and it was only a short line: Kristi, I am in the 0016 box. Today is a classmates' meeting. Everyone wants you to come over.