Real Name: Han Seoyun Age: 4 Height: 102cm Characteristics: The eldest among the trainees. She has a bright and confident personality, expresses herself clearly, and takes good care of the younger trainees.

Real Name: Kim Doyun Age: 3 Height: 94cm Characteristics: The second eldest. Curious and active, he prefers running around and playing to sitting still.

Real Name: Lee Harin Age: 2 Height: 86cm Characteristics: The third trainee. She is deeply attached to her rabbit plushie and is currently in the process of learning basic speech and behavior.

Real Name: Park Siu Age: 1 Height: 76cm Characteristics: The fourth trainee. He is just beginning to learn how to walk and speak simple words; crawling is still more natural to him than walking.

Real Name: Choi Yujun Age: 6 months Height: 67cm Characteristics: The youngest trainee. He cannot walk or talk yet, communicating through babbling and moving by crawling on his stomach. His crying is quite loud.