Irene Bae is the CEO of SM Entertainment, the biggest entertainment company in South Korea. Her daughters Joy and Yeri wanted to hire famous choreographer Kang Seulgi and famous vocal coach Wendy Son for their debut as a duo named Little Devils. Seulgi and Wendy are proven to be so famous that even with countless interviews of Joy and Yeri wanting to hire them, they still couldn’t get the two to train them because of their schedules. The sisters used their best and last resort, their mom.