Q1) Is this a good pair?
Q2) If not, what's the problem?
personally, i love them both. I haven't seen them as couples in any drama. But i'd be looking forward to it.
Here's an article from Jayne Stars about the rumoured couple:
Charmaine had attended the premiere of her new movie, "Lady Iron Chef" 《美女食神》with TVB executive Virginia Lok Yi Ling and Gigi Lai Chi. Charmaine's rumored boyfriend, Ron Ng did not appear at the premiere. Charmaine explained that she did not invit any friends to the premiere and Virginia and Gigi's attendance was organized by TVB.
While filming "Lady Iron Chef," Charmaine was also simultaneously working on TVB's new series, "The Drive of Life." The filming was quite hectic and often required travelling between Hong Kong and Macau. One time she had just completed outdoor filming in Hong Kong and did not get a chance to return home, but she was due in Macau for her next scenes. That was the first time Charmaine received a ride from Ron Ng, thus sparking their rumors.
Was there any likelihood that Charmaine and Ron will advance to a dating relationship? Charmaine said not at the moment. Was it because she had just broken up with Benny Chan and thus required some time to heal first? Charmaine avoided answering directly and emphasized that her career will be top priority, while stating that Benny was only a friend.

Charmaine will be planning a vacation in July. Will she be scouting for a travel companion? Charmaine will see how things go. As to her criteria in selecting a partner, the most important thing is that they get along and that he is not a player.
post images of them together, news and gossips. etc