In "Special Duties Unit", Kenneth Ma and JJ Jia are guest-starring in one of the cases as a pair of thieves who are abnormal killers. They receive gratification from killing people.
A tattoo artist shared pictures of their tattoos on her blog. The tattoo artist also revealed that Kenneth gave her a lucky pocket for the new year.
JJ was at a wedding dress event yesterday, and you can see that she still has her tattoo from the series.
Personal Note: Can't wait to watch the series! :D
*Credits to YUKI HENNA @ yahoo blog and the-sun