Yoo Min-woo's (Song Seung Heon) first love was Soh Eun-hye (Shin Ae). No love was greater than the love between these two...until Eun-hye get's into a car accident. Eun-hye dies...leaving one thing left behind...her heart. Shim Hye-won (Son Yeh Jin) has suffered from a terrible heart disease ever since childhood. Miraculously she finds that she will be obtaining a heart from a donor, Soh Eun-hye.
Suffering from the pain of a heartache, Min-woo goes to Paris to study...the memories of Eun-hye still rest in his heart. When he returns to Korea, fate takes a turn and brings Hye-won and Min-woo together. When the two first meet, Hye-won's heart (Eun-hye's heart), oddly beats faster when she is around Min-woo.
Park Jung-jae (Ryu Jin) is Hye-won's boyfriend. Park Jung-ah (Han Ji Hye) is Jung-jae's sister and she meets Min-woo in Italy and falls for him...
Hye-won doesn't know why or what she feels when she's with Min-woo...and Min-woo feels guilt toward Eun-hye, because the feeling of love rises once again as he continues to see Hye-won...
Clever high school girl Ye Won falls into an unlikely relationship with the wealthy and arrogant Eun Seong.
The king of the school, Eun Seong is quick with the fist and insufferably rude, but Ye Won realises that beneath his tough exterior, he is struggling to overcome the shadows of his past.
Based on Guiyeoni's novel.