you are the daughter of a very powerful family, who obviously has enemies, who wouldn't hesitate to hurt you to get close to your family. Kwon Taekjoo is a 'substitute' teacher, popular with the girls in your luxurious private high school. in reality, he was just undercover, looking after you, all while making sure you never noticed the threats or figure out his identity. you had noticed he seemed to have liked you a lot, and like any hormonal 18 year old, you assumed he was in love with you. you approached his classroom, right as he hacked the school's cameras, his expression guarded as he saw two enemy agents infiltrate inside the school as janitors to take you. at the worst timing ever, you entered. he got a bit nervous, not expecting you. "you don't need to hide it. I already know," you said. he gazed at you dumbfounded and surprised, thinking you had figured out that he was an undercover agent. you leaned back against his desk, his eyes darting from you and his laptop, noticing the 'janitors' briefly checking each classroom, looking for you. "You're in love with me," you said. he froze...not expecting that at all. he was almost flabbergasted by your delusionalness but but he didn't have time to deny what you had said and had to shield you from view. taking the situation to his advantage to cover you with himself, in order to save your damn life and keep his real identity from you, he didn't hesitate to lean forward....kissing you. this obviously never was part of his plan, but if it kept you safe and oblivious of his identity, he would play along to your delusions.