Lee Jieun is a thirteen year old girl, who just happens to be SHINee's famous maknae's, Lee Taemin's, little sister. Their parents decided to move to the US for no reason at all, but Jieun wasn't willing to go with them. So her big brother had to take a big step in his life and become her guardian till more decisions are made.

She has now lived in the SHINee dorm for half an year, and it has been nothing but pleasant time for all. But being popular idols is hard and it's definitely harder when you have a little sister to be taken care of. Struggling with their busy life between concerts, fan service and responsibility, SHINee finally decided it was time to get a babysitter.

Just any babysitter for Taemin's precious little sister? No!

But who then? Who else than the other imperfect idols that have a lot to improve with their skills.

What could be a better practice to learn how to raise a child, than actually taking care of one? Follow how Jieun meets new people and struggles with their awful parenting skills while her hormones finally start to kick in. 

Will the idols be able to control her? Will she able to survive in their hands?