Takeuchi Kozue manga
From Noctis Op.92: What exactly is the difference between a robot and a human? In a dystopian future in which robots are becoming increasingly commonplace, a young boy named Hogu lives in near poverty with his grandmother and sister. Though he innately possesses a kind soul, he is ostracized by his classmates and frequently bullied. At the beginning of the story, we find Hogu, friendless and alone - until he meets a robot girl...and our story begins.
After years of frustration, Kim Gidoo is about to have his first time with the girl he loves. But then, he's kidnapped by a group of suspicious people, and learns that he's to become a hero thanks to his super-powered sperm...
Ha Il Kwon's debut work. The "beauty" virus is spreading around the nation, targetting ugly girls and driving them to madness. Park Jangmi wonders - why must life be so unfair? As she ponders, she stumbles upon a mysterious barber shop, with a mysterious barber...
"Long ago, when danger approached the Earth there existed people exhibiting superhuman powers in order to save it; helping the weak and defeating evil for justice, not hesitating to sacrifice such beings... People distinguished them by calling them heroes. However... the era somehow changed..."
Shik-nam is a student that's obsessed with his grades and studying, so much so that, for him, solving problems and equations can reach erotic levels. Needless to say, his interest in anything other than his studies is near zero. Then comes a complication. The animal kingdom is furious with what the world has become, so they sent Yegrinna, the dog princess, to punish the sinful humans for dirtying the world by turning them into animals. And out of all the places she appears, it's at our unfortunate protagonist's room. What awaits Shik-nam and Yegrinna now that their fateful meeting has set into motion plans long since in wait?
Strange things are appearing from the sky, and the world is slowly dying. In Korea, there aren't enough military men to fight these enemies off, and high-school and college students have no choice but to join the military and help the others survive - at the risk of their own lives.