After Oh Jung-gu died, his Yung partne aka Dong-pal flew around to find a new comatose human to possess, and you, who happened to be possessed by him while you were on your way home from school. And strangely, when Dong Pal possessed and entered your body, you only staggered and stumbled, but did not faint or lose consciousness. And before you can figure out what just happened, your hair suddenly becomes curly and gets entangled in the battle between the Counters and the evil spirit - Ji Chung-sin

Ji Chung-sin saw you, and he rushed at you, intending to take you hostage because he thought you were just a normal citizen and not a chosen one