She also guest starred in the television series Kung Fu: The Legend Continues, Judging Amy, Six Feet Under, and Odd Job Jack.
In 2003, she was cast in a supporting role opposite Diane Lane in Under the Tuscan Sun, followed by a supporting role in Alexander Payne's critically acclaimed drama Sideways (2004).
Around the same time, she won roles in biographical TV films of two significant female Chinese-Canadians: as Vancouver author Evelyn Lau in The Diary of Evelyn Lau (Oh won the role over more than 1,000 others who auditioned); and as Adrienne Clarkson in a CBC biopic of Clarkson's life.
Oh came to prominence in Canada for her lead performance in the Canadian film Double Happiness (1996), playing Jade Li, a twenty-something Chinese Canadian woman negotiating her wishes and those of her parents.
While at Sir Robert Borden High School she was Student Council President.
She also played the flute and continued both her ballet training and acting studies; however, she knew that she "was not good enough to be a professional dancer" and eventually focused solely on acting.
D’autant que Gérard Mortier l’avait déjà remis au menu de l’Opéra de Paris en 2008...Rares sont les sopranos qui ont mis à leur répertoire les trois reines de la trilogie donizettienne des Tudor, tant ces rôles appartiennent des typologies vocales différentes. Au poker, la quinte flush royale est la plus forte main qu’un joueur peut espérer.A l’opéra, elle pourrait symboliser cette première d'Un ballo in maschera au Metropolitan Opera de New York : Dolora...This interest led her to take drama classes, act in school plays, and join the drama club where she took part in the Canadian Improv Games and Skit Row High, a comedy group.Against her parents' advice, she rejected a four-year journalism scholarship to Carleton University to study drama at the prestigious National Theatre School of Canada in Montreal, paying her own way.