Everyone experiences trials and errors as one lives their life. Those trials and errors become one of the memories of embarrassing moments. Despite one’s strong resolution to not do it again, it happens again. Just like we used to make review notes to find the correct answer, we might be able to get a brighter future through embarrassing moments. A math teacher (Jun So Min) gets chosen as an exam writer for College Scholastic Ability Test and attends a training camp. Between her first love (Park Sung Hoon) and her ex-husband (Oh Dong Min), she makes an amusing and sweet journey to try to find her own answer.