Upcoming kdrama heavy hitter “Vagabond” has just begun casting its secondary characters. First to sign was Hwang Bora, the “cute” secretary from currently airing “What’s Wrong With Secretary Kim.”  Hwang Bora is one of those actors you don’t realize you know.  Did you know she was in “Arang and the Magisrate?”  She was.  How about “Love Rain?” Yep, there too.…