The Brothers Sun Season 1 finds Mama Sun (aka Eileen, played by Michelle Yeoh) between a rock and a hard place. Eileen fled Taiwan and the Jade Dragon gang, taking her youngest son, Bruce, with her. She didn't want to be part of the Triad infighting anymore, so she left her husband, Big Sun, and her eldest son, Charles, behind.
Source：https://www.cbr.com/the-brothers-sun-season-1-ending-explained/
