Zhen left around half past twelve.
She chatted with Luo Ziling in the private room for about an hour.
After Zhen left, Luo Ziling didn't immediately leave, but continued to sit there drinking tea.
Wuyue came in shortly after.
When she came in, she retrieved the listening device from under the table.
While standing next to Luo Ziling earlier, she discreetly used Luo Ziling as cover to place a listening device under the table near him. With this, she was able to hear all of the conversation between Luo Ziling and Zhen.
Having Wuyue plant the listening device was, of course, Luo Ziling's idea.
He was afraid he wouldn't remember everything Zhen said, or remember completely, so he asked Wuyue to set up the listening device to record everything the other party said.
Zhen didn't notice at all. Although she is skilled in this area, she couldn't compare to Wuyue and her team's expertise in performing such subtle actions.
