The younger sister of the Baek & Ah siblings. She has a hearty personality, a big appetite, a loud voice, and laughs easily. She often gets her left and right mixed up. She is a member of the Gogo Friends.

The older brother of the Baek & Ah siblings. He is agile and has a strong competitive streak and adventurous spirit. Sometimes his excessive passion leads to a short temper. He is a member of the Gogo Friends.

A genius with high intelligence and excellent spatial perception. Due to his blunt personality, his friends tease him by calling him 'Pyeong-copath'. He is a member of the Gogo Friends.

He has a cheerful personality but isn't very bright and is easily frightened. He has low physical stamina and gets tired quickly no matter what he does. He is a member of the Gogo Friends.

A cute angel puppy who is lovely and full of aegyo. He adds '-chi' to people's names or at the end of his sentences. He is a member of the Gogo Friends.

A messenger from the Joseon Dynasty in the parallel universe 'Haeon'. He makes a massive request of the Gogo Friends. (Not a member of the Gogo Friends)

The governor ruling Gyeonggi Province in the Joseon Dynasty of the parallel universe 'Haeon'. He was once a loyal subject of King Sejong the Great, but is currently committing evil deeds. (Not a member of the Gogo Friends)