A mystery solved

In the last few weeks, I've noticed a series of posters appears in the MTR stations.  They feature mostly men staring moodily at the camera, dressed in designer suits or dinner jackets, with velvet bow ties and extravagantly pomaded hair.

The latest K-pop boy band, perhaps? A comeback tour for a once famous group? 

Maybe campy Macao magicians, a la Siegfried and Roy? Or high-class escorts for the lonely businesswomen of Hong Kong?

Perhaps the Asian answer to Peters and Lee (ask your grandparents)?

No, as it turned out, these are posters advertising the services of teachers. Yes, that's right: teachers.  I've probably said it before but I love Hong Kong!