Question: Who created the show Hagen von Lahnstein is a character in?

full_context: Document 1: Johannes von Lahnstein: Johannes von Lahnstein is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by actor Thomas Gumpert from 23 September 2003 to 9 January 2008.
Document 2: Hagen von Lahnstein: Hagen von Lahnstein is a fictional character on the German soap opera "Verbotene Liebe". The character has been played by Christoph Mory, after being introduced by Tom Viehöfer.
Document 3: Kim Wolf: Kimberly "Kim" von Lahnstein (adopted Wolf, married Sanchez) is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". Lisa Tomaschewsky introduced the role on April 13, 2011, but was eventually recast with actress Nicole Mieth, who took over the part on May 10, 2011.
Document 4: Christian Mann: Christian Mann is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". He is portrayed by actor Thore Schölermann from 27 November 2006. Schölermann was initially supposed to take a break after December 2012. However, it was later reported that the actor will not return full-time but in a limited capacity.
Document 5: Lahnstein family: The Lahnstein family is a very wealthy and aristocratic prestigious fictional family on the German soap opera "Verbotene Liebe (Forbidden Love)". The Lahnsteins have been a staple on "Verbotene Liebe" since their introduction in September 2003.
Document 6: Constantin von Lahnstein: Constantin von Lahnstein is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)" and was portrayed by actor Milan Marcus. He made his first appearance on 9 December 2004. The character was introduced as the last original member of the Lahnstein family as a troublesome teenager that grow up at his aunt's in Italy after his mother died. He has been featured in numerous storylines, including finding his biological father, his friendship to Paul Brandner, his relationships to Paul's sister Lisa and Judith Hagendorf and an affair with the former wife of his cousin, Nathalie Käppler. Marcus decided to focus on college in 2008 but stayed with the show until his last appearance on 5 January 2011.
Document 7: Arno Brandner: Arno Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by actor Konrad Krauss, who first appeared in the series premiere on 2 January 1995.
Document 8: Oliver Sabel: Oliver Sabel is a popular fictional character in the German soap opera "Verbotene Liebe (Forbidden Love : in English)". The character is portrayed by actor Jo Weil from 31 December 1999 to 3 September 2002 and again since 2 November 2007.
Document 9: Dana Wolf: Dana Wolf is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". She has been portrayed by Diane Willems from 27 January 2011 to 10 September 2014.
Document 10: Helena von Lahnstein: Dr. Helena von Lahnstein is a fictional character of the German soap opera "Verbotene Liebe (Forbidden Love)". The character has been played by Renée Weibel since October 5, 2009.
Document 11: Jan Brandner: Jan Brandner is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character was played from the show's debut on January 2, 1995 to August 27, 1997 by actor Andreas Brucker. In March 2011, the role was surprisingly recast with actor Hubertus Grimm; reinstating the Brandner family and the original story of the show. Grimm debuted in the role on June 23, 2011. The role was reactivated on short-term for a special of the show on the Spanish island Mallorca. The character made his last appearance on January 18, 2012.
Document 12: David Brandner: David Brandner is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)" portrayed by actor Sven Koller from September 11, 2008 to June 15, 2010.
Document 13: Verbotene Liebe: Verbotene Liebe (, lit. "Forbidden Love") is a German television soap opera created by Reg Watson for Das Erste. The show is set primarily in the German city of Düsseldorf although, at times, the city of Cologne and the Spanish island of Majorca have figured prominently in the show's story lines. First broadcast on 2 January 1995, "Verbotene Liebe" was originally broadcast in 24-minute episodes, five times a week. It expanded to 45-minute episodes on 21 June 2011 and trimmed back to 40-minute episodes on 23 January 2012 to accommodate an adjusted time-slot. In 2006, Pay-TV network Passion began broadcasting episodes of the show from the beginning.
Document 14: Jens Kramer: Jens Kramer is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed on recurring basis from September 24, 2008 to March 3, 2009 by actor Antonius Hermlin. The actor returned afterwards as a hallucination, before seen again in September 2010, when Jens is released from a psychiatric clinic, to the character's death in October 2010.
Document 15: Sebastian von Lahnstein: Sebastian von Lahnstein is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by actor Joscha Kiefer from November 26, 2007 to October 13, 2009. The part was recast with Sebastian Schlemmer who took over the role on October 19, 2009.
ground_truth: Reg Watson
sub_queries: Which show is Hagen von Lahnstein in? Answer: Verbotene Liebe
Who is Verbotene Liebe by? Answer: Reg Watson