Ja Na and Soo Ann are two extraordinary girls that have known each other since they were young. Their friendship was like no other- as strong as sisters. Ja Na is very smart who is good in Maths and Sciences. On the other hand, Soo Ann is a lover of arts. Despite of their differences, both of these girls were admired by their schoolmates because of their beautiful outer and inner personality.

When they entered sophomore year, they met Kyuhyun. Kyuhyun was dazzled by Ja Na at first sight. Determined to make Ja Na like him, he asked Soo Ann’s help to make her fall for him. What Kyuhyun does not know is Soo Ann has a secret crush on him. Soo Ann, aware of Kyuhyun’s intention, still decided to help because this is the only way for her to get close to him.

This is not your typical cat-and-mouse setting where they chase each other out. What if the mouse refused to ran because it knew it's nearing inevitable doom? Afterall, it is as it should be. And how about the cat, will it be selfish to grab the opportunity for the kill or be crazy to let it slip away? Until when would be friendship enough to sacrifice what you want for the sake of your bestfriend? Will you throw away lifetime's worth of friendship just for love? Can the heart be persuaded to love somebody else?