A survival expert who heads to Africa to appear in a parasite documentary. Though he hesitated at the mention of the remote wilderness, he decided to join with hopes of becoming a popular star. Unlike his previous adventures, there doesn't seem to be much for Geo to do due to his lack of medical knowledge... However, the boredom is short-lived. When a patient infected with Guinea worm appears in the village, his moment to shine as a survival expert finally arrives! Our survival king even solves the mystery of the Guinea worm aboard the Hippo! He possesses the stamina to run all over the village catching dogs to prevent parasite infection, and the reflexes to quickly block a sleeping sickness patient who suddenly lunges at Kito. Despite his lack of medical knowledge, he assists Dr. AD and Kay with his excellent intuition and adaptability.

Decides to leave for the African wilderness with a blushing face upon hearing that his college senior, Dr. AD, is there. Usually prickly, he transforms into the most angelic junior in front of AD, taking on all the hard work. Although his body couldn't keep up and he eventually collapsed, he was nursed back to health by Dr. AD. He feels rage toward Director Q for stealing the Hippo, but he holds it in.

A local boy working as Dr. AD's assistant. He respects Dr. AD as a mentor and yearns for her recognition. While he is very polite and helpful toward Kay and Director Q, he is exceptionally prickly toward Geo, viewing him as a rival. However, he is seen spending a lot of time close to Geo, and he even rode the Hippo to help treat Kay when he was sick. In the end, he shows his respect for Geo by shaking his hand.

A director who pours his passion into filming documentaries. He was originally called PD Gu, but he calls himself Director Q, claiming he has dedicated his soul to documentaries. The problem is that his passion is so intense it causes significant trouble for others. His obsession with the documentary is so strong that he jumps bare-bodied into habitats swarming with tropical disease mosquitoes, interferes with patient treatment for the sake of a shot, or even steals the Hippo from Kay.