On the first day, Lu Jincheng tidied up the conference room and planned to return to his room to sleep. As he passed Professor Liu's room, he noticed the door was open, and a lady was cleaning inside.
He hesitated for a minute, thinking he might as well go all out. He went back to his room and grabbed a low-quality bugging device he had bought earlier. He returned to the elevator and called the front desk, pretending he had forgotten his room card. Soon, the cleaning lady received a walkie-talkie message saying a guest had forgotten their room card and needed help opening the door. Lu Jincheng seized the opportunity to slip into the room and tossed the "little sphere" into the kettle.
