There wasn't anything she wouldn't do for love. For Na Ji-ni, she thought her love would last. Then suddenly, her boyfriend announced on their one-year anniversary, "You think this is love? Ask your ex-boyfriends. You think they loved you?" Wallowing in her misery, she reminisces about her past loves. Her innocent first love with Gu-hyeon, walking around the campus with Jeong-seok, exciting moments with Yu-inthese all remain as precious memories. She sets out to meet each of her past loves with only one question to be answered "Did you really love me?" Her ex-boyfriend's last words ringing in her ears, she decides to get the real answer. But, as she finds them, the men of her past are no longer the men as she remembered them in her diary. They seem like strangers to her. They deny that they loved her and destroy her memories of love. But she knows what she felt it's clearly recorded in three volumes of her diary! She decides that she will get "compensated" for the love she gave each man. "I recorded everything to the last detail! I will get it back!" she resolves. She sends copies of her diary to each of the men from her past. The three men feel uneasy having received Ji-ni's diary. Her warning to the men of her past: "I am telling you, don't take my love for granted!"