Ophelia was called to the Hong Kong Bar in 2006. She is a civil and criminal practitioner.

Her practice covers industrial summons, white-collar crime, corruptions, commercial frauds, conspiracy offences, sexual offences, trafficking in dangerous drugs, immigration cases, customs and excise cases, forfeiture proceedings, road traffic matters, commercial disputes, probate, personal injuries, Chinese Medicine Council board appeal and matrimonial proceedings.

Ophelia was previously a Lecturer of Law in Tertiary Institutions and a Lecturer of In House Legal Training Course at Governmental Departments. The lectures span a wide range of areas, including business law, family law, probate and prosecution.