When authorities officer Kyungjin and Myungwoo met in a crime, she discovered that this responsible teacher was an extremely wonderful guy. With a whole lot of high school kids, Kyungjin got into a fight at the night and got problem in a large gun fight between rival drug dealers. Myungwoo tried to help her but then something happened that forces them remained together all day. They got closer to one another and Myungwoo wasn't able to repulse the character. He fell deeply in love . One day, when Kyungjin was pursuing a notorious offender, Myungwoo helped her again, however, perhaps not knowing that what could happen that day changed their relationship forever...