Han Shin-Woo is a student at Ye Ran High School known throughout the city for his martial arts prowess—he's skilled in Taekwondo and Hapkido and genuinely feared by local gangs. He's got bright red hair, usually sports a bandage across the bridge of his nose, and is more attractive than people tend to notice, mostly because his attitude doesn't really advertise it.
He meets Rai on the way to school the day Rai awakens, and they gradually become close friends. From there, Shin-Woo gets pulled into increasingly bizarre fights involving people with superhuman abilities, though Rai and Frankenstein always manage to bail him and the others out. Eventually, everyone involved gets mind-wiped for their own protection—they forget the whole ordeal.
Personality-wise, Shin-Woo's the type to sleep and drool through class, showing up late thanks to chronic oversleeping. He's lazy academically, sure, but genuinely courageous and fiercely protective of his friends. He's had feelings for Yuna for years and once confessed to her, which went about as awkwardly as you'd expect; they're just friends now, though he clearly hasn't entirely moved on. He's also starting to develop an interest in Seira.
Ability-wise, Shin-Woo is genuinely impressive. He possesses exceptional strength and speed even by normal human standards—fans often note how he vanished instantly to help Yuna when she called for him. His agility and reflexes have sharpened over time, letting him dodge attacks and counter in the same breath. But his real superpower is durability. He can take hits that would kill an ordinary person and keep fighting—he's gotten back up against opponents like Shark after taking brutal beatings, and has managed to match the power of M-24's Infected as the series progresses.
Content compiled by AnimeList.moe from publicly available sources.