Question: Who was a cast member of the show featuring the character of Christian Mann?

full_context: Document 1: Jana von Lahnstein: Jana von Lahnstein ("née" Brandner) is a fictional character in the German soap opera "Verbotene Liebe" ("Forbidden Love"). The character was played by the actress Friederike Sipp from 1 October 2002 to 21 March 2005. The character was recast with Vanessa Jung, who played the role from 23 March 2005 to 20 February 2008.
Document 2: 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 3: 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 4: Lydia Brandner: Lydia Brandner (divorced von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe" (Forbidden Love). The role was originated by actress Theresa Underberg on 16 January 2008. Theresa announced on 21 December 2010 that she will leave the show in early 2011. She made her last appearance on 29 March 2011.
Document 5: Gregor Mann: Gregor von der Waldenau (born as Mann) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)", portrayed by actor Andreas Jancke. He made his first appearance on screen on 16 February 2005 and left the show on 12 March 2010.
Document 6: Stella Mann (Verbotene Liebe): Stella Mann is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by model and actress Anne Wis from December 9, 2008 to November 10, 2009. She returned to the show with Claudia Hiersche as Carla von Lahnstein from January 28 to February 11, 2010.
Document 7: Timo Mendes: Timo Mendes is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". Remo Schulze debuted in the role on 23 June 2011. Timo is the son of Julia von Anstetten and her first husband Tim Sander.
Document 8: Clarissa von Anstetten: Clarissa von Anstetten (née Prozeski and formerly Kaufmann) is a fictional character on German soap opera "Verbotene Liebe (Forbidden Love)". The character is played by actress Isa Jank from the show's debut on 2 January 1995 to 5 September 2001 and again since 21 June 2011. She left the show again on 20 March 2013.
Document 9: Nathalie Brandner: Nathalie Brandner (née Käppler, formerly von Lahnstein) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)". The character is portrayed by actress Jenny Winkler. She first appeared on 12 November 2004 and had her final appearance on 14 December 2010.
Document 10: Lars Schneider: Lars Schneider is a fictional character of German soap opera "Verbotene Liebe (Forbidden Love)". The character has been played by actor Herbert Ulrich from 24 October 2002 to 18 May 2005 and again from 13 October 2006 to 29 August 2008.
Document 11: 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.
Document 12: Fabian Brandner: Fabian Brandner is a fictional character on the German soap opera "Verbotene Liebe (Forbidden Love)". The character was portrayed by Shai Hoffmann from January 22, 2008 to August 14, 2008 and in guest appearances from January 12, 2009 to January 22, 2009.
Document 13: Julia Mendes: Julia Mendes (born Prozeski, adopted von Anstetten and formerly Sander) is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)", played by Valerie Niehaus. She is introduced in the series' premiere on January 2, 1995. She departed from the series in July 1997, when Niehaus decided to pursue other roles. The role was surprisingly recast with well-known actress Nina Bott in 2011; reinstating the Brandner family and the original story of the show. Bott appeared for the first time on-screen on June 23, 2011. She eventually finished shooting her story arc in October 2011 and last appeared on January 18, 2012. The character is known as the first protagonist of the show and her main story focuses around the incestuous love to her twin-brother Jan Brandner.
Document 14: 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 15: Matthias Brandner: Matthias Brandner is a fictional character from the German soap opera "Verbotene Liebe (Forbidden Love)" portrayed by actor and entertainer Thomas Ohrner. He made his first appearance on screen on 15 January 2008 and had his final appearance on 14 December 2010.
ground_truth: Valerie Niehaus
sub_queries: Which show is Christian Mann in? Answer: Verbotene Liebe
Verbotene Liebe >> cast member Answer: Valerie Niehaus