Ji-Hye and Soo-Kyoung are friends attending the same university and both have a crush on Sang-Min who is in their drama club. The more clamorous and outgoing of the two, Soo-Kyoung, asks Ji-Hye to do her a favor - write a love letter to Sang-Min. Ji-Hye pours out her own feelings for him on paper, but sadly in her friend's name. Touched by the letter, Sang-Min is attracted to Soo-Kyoung, and Ji-Hae, feeling uncomfortable and even guilty, tries to avoid him. And yet by coincidence or by fate she keeps running into him.
Ji-Hye has lived alone with her mom since her childhood, when her dad unexpectedly passed away. Her mom is now on a trip abroad, and to wile away her solitude she starts cleaning the attic. There Ji-Hye finds a secret box, in which her mom kept the memorabilia of her first love story of some decades past.