What episode is Ng Cheuk Hai's message to Andy Lau?

Ng Cheuk Hai's message to Andy Lau is his brother's second season. Everyone thinks that Ng Cheuk Hai and Andy Lau have a profound friendship. In fact, they just co-produced the bomb squad on 17. On the movie poster, Andy Lau is in the middle and Ng Cheuk Hai is on the side. Obviously, it wasn't a coffee spot, and there wasn't much personal communication.