After Dr. Beltran (guest star Natalie Morales) assigns Kwan (Harry Shum Jr.) work that he feels is less than he's capable of handling, Dr. Beltran sets him straight about being a doctor -- especially in pediatrics. From 'Grey's Anatomy' season 20, episode 3, 'Walk On the Ocean.' Watch 'Grey's Anatomy' THURSDAYS 9/8c on ABC. Stream on Hulu.