Twice as kids in a daycare. 

Students:

Im Nayeon (7) a.k.a the fake maknae. Believes she is the youngest (despite being constantly reminded that she's the oldest) and is always seen together with Jeongyeon. 

Yoo Jeongyeon (6) is the quiet but reliable older sister. Eats practically anything in sight and she doesn't mind having Nayeon clinging onto her all the time. 

Hirai Momo (6), the oldest in the foreign line. She may or may not have an addiction for pig's trotters (jokbal), to the extent of having a custom-made jokbal plushie. Her pockets are always full of snacks. Believes in the saying, "Sharing is caring" however will not hesitate to punch someone if her snacks are stolen.

Minatozaki Sana (6) a.k.a ClumSana (Clumsy + Sana). Second oldest in the foreign line. She's too cute for her own good. Similarly to Momo, she has gummy bears in her pockets. She finds Dahyun's nostrils fascinating and has a soft spot for the youngest in the daycare, Chou Tzuyu. 

Park Jihyo (5) is the shy girl with a loud voice. She is always teased for her loud voice, causing her to only speak when it is necessary. Jihyo is also constantly the victim of Tzuyu's teasing and cries easily.

Myoui Mina (5) is practically a child genius but very quiet. Her bestfriend is Chaeyoung and she comes to school with a penguin backpack. Has a weird habit of sleeping with two particular penguin and tiger cub plush toy. Although timid, is courageous. 

Kim Dahyun (4) is the girl with really really really really soft skin. She is probably one of the most active kid in the daycare. She's flexible and likes to pinch her own cheeks till they're all red. 

Son Chaeyoung (3) a.k.a the artist. Her pockets are filled with either markers or colour pencils. She likes drawing on practically any surface. Similarly to Mina, she has to sleep with two particular penguin and tiger cub plush toy. Doesn't understand why but she always has a soft spot for Mina. 

Chou Tzuyu (3) the youngest in the daycare and foreign line. She carries around a dog plush toy she named Minjung. Despite being the youngest, she's known for always teasing the older kids. However, the only person she would never tease or disturb would be Minatozaki Sana. "Must protect Sana unni at all cost!"