Bailey Drew Sok was born on February 24, 2004, in Placentia, Orange County, California, to Korean parents, where her mother was formerly crowned Miss Korea, and as the youngest of three daughters. She was exposed to music and dance at a young age through her sisters who competed in the art, influencing her to dance at two-and-a-half years old. Her parents enrolled her for lessons following an advice given by the director of her sisters' studio, training in classics including jazz, ballet, and tap; as well as summer intensives in Los Angeles taught by Matt Steffanina by age five.