This is the story about the little Yoong, who loves to eat and easily sulking because she cannot brag about her parents to her friends. She is seven years old, and she is confused why is the girl around her ages hates to eat. Food is good, and it makes Yoong happy.

Then there is little Seungri, a boy who his a charmer and think that cartoon is for babies, so he watch History or National Geographic channel instead. He is a few months younger than Yoong, but he is the only one who can talk rationally with Yoong. He always know that he is cute and no one can say no when he smile or giving his aegyo face.

And there is Seobaby, she loves to watch cartoon and listen to children music, that is why Seungri call her with Seobaby, she loves Keroro and she can sing all Keroro's song. She is only eat healthy food, get an influenced from her aunty about living a long life, when Yoong get angry only her can calm Yoong down.

They are just ordinary children who cannot show their happiness or brag about their parents to other people, even to their own teachers. Which makes them really sad, but they deal it with their own ways, in their ages.

Until one incident force their parents to show up.

And their life are change...

...forever.