Choi is actually engaged to a doctor, while Lee Yoo-Rim dated the same woman for the past six years.
While Lee Yoo-Rim seems to be content with having their relationship continue as an affair, Choi worries about having sex without “love.” Eventually the administration at their place of work finds out about their relationship and they must now hide or reveal their relationship.
Choi refuses, of course, especially since she has a boyfriend already.
She also avoids Lee's continuous attempts to make a pass at her, but does so in a strange passive way, as if she isn't really unwilling. After the two spent the night together, their relationship just starts to get interesting.
the film is about sexual harrasment and its effects on a beautiful student portrayed by KHJ.
the film starts with her mentoring under another teacher counselor who is her junior, as an effect of that previous harrasment by her which is only revealed later on.
Choi then using his position as a superior and any other method he can think of tries to get Choi to go out with him and eventually he succeeds.
In fact director Han Jae-rim's debut is a romance drama that tells a good story with extraordinary characters.An introvert, indifferent woman joins a high school as a student teacher, under supervision of a shameless, nymphomaniac man who is a year younger than her.On a school trip, the supervisor tells the trainee that he wants to have sex with her.In his view, dating is meant solely for sexual gratification. The result is a sexy, mature, and unconventional romance that may be too challenging for some. Rules Of Dating (or known in the subtitles as To Do Or Not To Do) stars Kang Hye Jung (Old Boy) and Park Hae Il (Memories of Murder) as high school student teacher Choi Hung and her counselor Yu Lim.Choi Hong has a boyfriend of her own, a man she one day hopes to marry. We meet the two at their first meeting when Yu Lim initiates a frank sexual conversation.To make matters even stranger, Yu Rim already has a long-time girlfriend. The posters for Rules Of Dating include the two protagonists smiling in an oh-so-sly way that might suggest this to be a relaxing romantic comedy. In fact, it poses quite a complicated question Should love and sex be the same thing?