My Tutor Friend (2003) (Korean)

Plot
College student Choi Su Wan (Kim Ha Neul) is forced by her mother to take a tutoring job. But her student turns out to be Kim Ji Hoon (Kwon Sang Woo), an uncouth 21-year-old high school student with great fighting skills and serious authority issues. The spunky Su Wan, however, refuses to back down and ends up involved in Ji Hoon’s life in more ways than she expected. Amidst the fighting and bickering, Ji Hoon finds himself falling for Su Wan, but her heart seems to lie with someone else…

“… You may find this film a typical story but it hit me, and I love watching it over and over again. Heh! Well, I just realized that it already had a follow-up (My Tutor Friend 2) as I’m making this post.” - Jun Celso