Kim Yutin is a fast-acting, short-acting contraceptive pill that works mainly by inhibiting ovulation and preventing a pregnant egg from settling. It is usually taken within 72 hours of sexual intercourse or contraceptive failure, the earlier the better the effect, one pill at a time. The drug has few adverse reactions, some women may experience gastrointestinal symptoms, such as nausea and vomiting, which usually do not require special treatment and can disappear on their own. Some women may experience early or delayed menstruation, and if menstruation is delayed for more than a week, they should go to the hospital in time to rule out pregnancy caused by contraceptive failure, and some women may experience allergy or cause liver and kidney function damage, so it is recommended to take it correctly and reasonably under the guidance of a specialist.