1999: At the end of the millennium, the Kim family is struggling to move on after their mother, Sunny, vanished a year ago. Sixty-one-year-old John Kim feels more isolated from his grown children than ever before. One evening, their fragile lives are further upended when John finds the body of an unhoused stranger in the backyard with a letter to Sunny, leaving the family with more questions than ever. 1977: Newly married, Sunny is pregnant and has just moved to Los Angeles from Korea with her hardworking and often-absent husband. America is not turning out the way she had dreamed it to be, and the loneliness and isolation are broken only by a fateful encounter with a veteran at a bus stop. The unexpected connection spans decades and echoes into the family’s lives in the present as they uncover devastating secrets that put not only everything they thought they knew about their mother but their very lives at risk.