Logo text Sandra Oh gained fame and fortune starring on  Grey’s Anatomy , but playing Dr. Cristina Yang for 10 seasons on the hit ABC medical drama called for keeping her family’s Korean roots under the radar. “The fact that half of the cast of Grey’s Anatomy weren’t white, that was a thing,” Oh, who was born in Canada to Korean immigrants, says in a clip for director Eugene Yi’s documentary The A List: 15 Stories From Asian and Pacific Diasporas , ahead of a May 13 debut on HBO and HBO Max. “And it was almost like, ‘Shush. Let’s just not talk about it. Let’s just do it and see if we can get away with it. Oh my gosh, it’s a hit!” Oh says of the groundbreaking, ethnically diverse cast of the Grey’s Anatomy drama, created and executive produced by Shonda Rhimes . Oh broke out in Canadian indie movie hits like Double Happiness and The Diary of Evelyn Lau before moving to Hollywood and making history as an Asian actor with her primetime Emmy nominations for her lead role as Dr. Cristina Yang.…