Fan Casting Lee Jae-shin in Scales: Mermaids are Real - The King 2 Hearts (2012)

The Princess of South Korea who is also King Jae-ha and the former King Jae-kang's younger sister. A royal by day and an underground rock band singer by night. She has a somewhat naughty sense of humor, which once got her arrested by Eun Shi-kyung (not knowing her true identity) when she dressed down and made fun of her royal self. However, she is paralyzed after her brother Jae-kang's death and her kidnapping. But she later undergoes recovery in which she also believe in the existance and conservation of mermaids, thus she joins her brother and fiancee's investigation into Gary Witts and his mermaid hunting activity with a joint South-North Korean investigation task force led by them.