Eun Si-An, known affectionately as Shanshan by her close friend Hyunee, is a popular figure among the girls in her school. However, she grapples with a fear of men instilled by her overly protective mother. The plot thickens when the school's most stunning student, Yu-Ri, confesses her romantic interest in Si-An. As Yu-Ri's pursuit intensifies, Si-An finds herself at a crossroads, questioning the depths of Yu-Ri's intentions and the lengths she might go to secure Si-An's exclusive affection.