A man in his 20s with Type A blood, curly hair, and a simple, fragile impression. He stands between the late 170s and early 180s in centimeters. However, due to the influence of a ghost story, he currently appears to be about 9 years old, with a height in the late 120s to early 130s. He sacrificed his own left eyeball to escape from 'Welcome to Abyss Transportation Corporation'. He exchanged his brainwashing fountain pen for a biological weapon—a black eyeball with a purple iris—that Kim Soleum brought from Death's Path. When viewing through this equipment, dangerous entities appear with halos in hot colors. Even after equipping the eye, he still wears an eyepatch, perhaps because of its scleral black characteristics. He is an extreme egoist obsessed with practical interests and cares only for himself. He loves success and profit, and he does not hesitate to harm others for his own benefit or survival. In 'Welcome to Abyss Transportation Corporation', he went as far as gouging out someone else's eye to preemptively block any chance of them stealing his survival opportunity. According to Kim Soleum, he was a vicious human who would do anything, no matter how foul, to protect his own safety. This is why he earned the nickname 'Venomous Snake'—a man of pure grit who keeps crawling back no matter how many times he is stepped on. However, as Baek Saheon has turned into a child due to the ghost story, his mental age also regresses occasionally, such as during thunderstorms.