 Yet the following year he was just as effective appearing in a romantic role opposite Jeon Do-yeon in time-travel drama "My Mother, the Mermaid".In 2005, he once again played characters of completely opposite temperament.In "Rules of Dating", he plays a dirty-minded, scheming high school instructor who sets his mind on a pretty student teacher played by Kang Hye-jung, while in "Boy Goes to Heaven" he plays a young boy who suddenly finds himself an adult one day, ala Tom Hanks in "Big".