Kim Da-in, a freshman who has always lived her school years with diligence and passion, dreams of a perfect campus life—complete with excellent grades, solid friendships, and outstanding achievements. However, upon entering university, she faces her first humiliation when she encounters Kang Da-in, who shares her name but is blessed with flawless looks and character. Alongside Nam Bo-young, who aspires to perfect beauty, Da-in begins a freshman life that unfolds in a completely different direction than she had imagined. Will Da-in be able to live her youth perfectly as she had planned? The most perfect campus life for young people yearning for the “perfect self.”