I was possessed by your Ex-boyfriend

On the first day at his new job, Jiwoong ends up falling in love at first sight with his immediate boss, Kim Sangha. He vigilantly looks for a chance to get closer to him, but is disappointed when he hears that Sangha is currently mourning his dead lover. Then one day, when Jiwoong is driving drunk Sangha home, he suddenly feels his body slipping away…?
Goodness, how do you deal with the aftermath of having sex with someone while being possessed?