The director and the main actor have the same name. This is because Ha Jung-Woo's real name is Kim Seung-Hun.
In 2012, there was an accident in Japan that was quite similar to the film. And it was also dubbed in Japan on Saturday, May 13, 2017. Lee Jung-Soo, played by Ha Jung-Woo, was Yuya Uchida, and Se-Hyun, played by Bae Doo-Na, was played by Mariko Higashiuchi.