There is a legendary girl in Dulihai Middle School - Park Il-kyo. She has an expressionless face and an indifferent personality, but she is a famous martial arts master in the country. One week after entering the metropolitan area, Riqiao unexpectedly took on the task of protecting two important transfer students. Two mysterious transfer students, one is the captain of the national defense team-Jang Chengdai, and the other is the heir to an international enterprise-Lee Jae-hee. Riqiao, who was originally born in a weird family, faced a new challenge. The antics of school friends, the "sleepover" of two transfer students, the random tasks taken over by parents, where will the relationship with Jae Hee go...