This is a 100% Pre-produced drama. Filming began on 2016-August and finished on 2017-March. It’s based on the 2001 movie “My Sassy Girl” but set in a historical time period. It’s about Love story of a cold city scholar Kyun Woo (Joo Won) who’s known as “Joseon’s national treasure” and the sassy princess Hye Myung (Oh Yeon Seo) in a Joseon Dynasty era.