Jin-Ho was originally from a civilian family in the Wind Country-however, at some point he must has had shinobi ancestors, because he was born with the horns of a famous blood-line limit. Sadly for him, these are an incomplete throw-back that do absolutely nothing but make him appear unusual and grow back when cut off.
Despite his civilian background, he began training himself physically at a young age, for no reason but he wanted to. Due to his strange personality and appearance, he was largely shunned by society, including his own parents. Only a boy named Sun Woo-Hyuk befriended him, and it didn't take long for Jin-Ho to dedicate his life and strength to protecting him.
Due to his hard work, Jin-Ho was noticed at the age of ten, and when he refused to join the Sand Village, Woo-Hyuk was kidnapped and held hostage. For three years, he was essentially the Sand's slave and committed a large number of atrocities; he attempted to break Woo-Hyuk out, but the other boy realised that Jin-Ho could not escape whilst protecting him, and purposefully died so that Jin-Ho could live a free life.
Instead, Jin-Ho became obsessed with revenge. His goal was to become the strongest shinobi there was, and kill all others, starting with the Sand, until everyone was free to make their own destinies, without the over bearing power of the shinobi influencing everything. To that end, he destroyed an entire country at the age of 15, earning him the notice of Akatsuki. When question why he did it, he simply said 'practice.'
After capturing Gaara, he sent Tsbuaki on ahead, and remained to cover her escape. During the fight, he was told the last words of Woo-Hyuk, and decided that whilst he could not overcome his desire for revenge, his desire for freedom from the shinobi world was stronger, and allowed himself to die in combat, claiming it was the only real choice he had made since Woo-Hyuk's death.
He possesses no special abilities of his own-he has merely taken the abilities that all shinobi are capable of using and trained them to the ultimate extreme. For that reason, his 'combat instinct' allows him to perfectly predict opponents movements and detect if a person is lying. His strength and speed in typical times is comparable to other shinobi using special techniques-he can effortlessly move faster than the Body Flicker just by running. Due to his even and balanced style, he has no major weaknesses aside from lack of special technique. When in a serious situation, he will snap his horns off and use them as weapons. Despite his achievements, he is not a very well known ninja as he never leaves witnesses, but the rumours of his strength still make him an S-class criminal.