After failing their Korean exam, the Gogo Friends were walking home in despair. Suddenly, a small, cute, and strange being appeared before them. Following it, they were whisked away to... the Joseon Dynasty?! To make matters worse, an unexpected crisis strikes the moment they arrive. Just then, glowing letters appear in the air! They have to fill in the blanks with the correct answers? But we're the ones at the bottom of the class in Korean!
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)
Areum! Youuuuu! Stop right there!
Puhaha! Do I look like a fool? Why would I listen to that?!
Heehee, I'm gonna show everyone your Korean score, Oppa~!
No! You better not let me catch you!
Heehee, you'll never catch me!
Release Date 2026.08.22 / Last Updated 2026.08.22