That was a device incorporating both a bug and a video recorder, and it was incredibly small and flexible, as thin as a strand of hair.
He planted it in Tang Sheng's hair.
The difficulty mainly lay in the materials used, as making it so small was no easy task.
Installing a listening device at Tang Sheng's residence, for them, was really too easy.
However, that approach required more time and also came with the risk of being discovered.
So, he went to great lengths to embed it in his hair, the only downside being that the device was still in its trial phase, meaning the technology wasn't fully matured.
It occasionally malfunctioned.
Hopefully, it would work fine this time.
Once Tang Sheng was back, he immediately sought Fu Rong, needing to check on Wen Cai's background, or more precisely, the background of the fake Wen Cai.
If he wanted to continue like this, he would definitely need to guard against Jun Mochan.
