Have you ever heard I Believe sang by Shin Seung Hun. Until now, the song always play in my mind whenever I need calm mood. It was an OST song for a blockbuster Korean movie entitled My Sassy Girl. My Sassy Girl Korean: 엽기적인 그녀 literally, That Bizarre Girl is a 2001 South Korean romantic comedy film directed by Kwak Jae-yong. It tells the story of a mans chance meeting with a drunk girl on the train which changes his life. It is ostensibly based on a true story posted on the internet in a series of blog posts written by Kim Ho-sik, which was later adapted into a novel.