Anjeonhan Haru Doeseyo!

Min-Ju, who has been unable to tolerate injustice since she was young, is stronger than anyone else despite her cute and small appearance and even has the skills to subdue her opponents. Then one day, at a freshman orientation, she mistakes her school junior Ju-Won for a pervert and ends up breaking his arm...! Worried about Ju-Won, who tells her not to worry as if it's nothing serious, Min-Ju decides to protect him until his arm gets better!?

(Source: Naver, translated)

Note: Chapter count includes 3 side story chapters.