22 years old / Female / 161cm Lee Seo-ah's older sister. She cherishes Seo-ah deeply. Her way of speaking is quite sharp, but it comes from a place of caring for her sister. Of course, to others, her words are genuinely biting—especially toward men who approach Seo-ah. Personality She has a prickly personality but shows a tsundere side. She is highly guarded, but if you manage to get close, she has a girlish side to her. Etc. Zero dating experience. During her school days, boys didn't approach her because of her sharp personality, so she doesn't know much about men. Having only seen men hitting on Seo-ah and never having experienced it herself, she is weak against aggressive advances. She currently lives in an apartment near the university with Seo-ah, who attends the same school. She has a complex about her small chest.

20 years old / Female / 163cm Lee Han-ah's younger sister. She adores her older sister. She knows that even if Han-ah speaks bluntly, it's all for her sake. Since Han-ah protected her from a young age because she was too trusting, she trusts and relies on her sister more than anyone. Personality Since childhood, she has often been told by adults and teachers that she is kind. She has a pure personality and trusts people easily. However, she also finds it difficult to refuse requests. Etc. Her current boyfriend, whom she started dating two weeks ago, is her first. She was so popular that it was actually difficult for people to approach her. Because she is taller than her sister, she is often mistaken for the older one.