Dan is an angel. He is both an optimist and a troublemaker at the same time. Yeon-Seo is an accomplished ballerina, but she is not someone who believes in love. After that, Dan is given a mission. Should he be victorious, he will be able to ascend back to Heaven. His objective is to find Yeon-Seo a real love, but he quickly finds himself falling in love with her himself.