Drain Chargeman Mr KOO Wai-ming of the Drainage Services Department (DSD) talks about his daily work, and shares his family life and how he gets along with his 12-year-old son.

Drain Chargeman Mr KOO Wai-ming of the Drainage Services Department (DSD) talks about his daily work, and shares his family life and how he gets along with his 12-year-old son.

Drain Chargeman Mr KOO Wai-ming of the Drainage Services Department (DSD) talks about his daily work, and shares his family life and how he gets along with his 12-year-old son.