State-run broadcaster KBS on Monday released behind-the-scenes photos of actors shooting for “Orange Marmalade,” a TV drama based on the webtoon of the same name.In the photos, actors are shown enduring a scorching heat going back and forth between indoor and outdoor filming sites, demonstrating their passion for their roles. The main characters -- Yeo Jin-goo, Seolhyun and Lee Jong-hyun -- are said to have practiced martial arts designed for some historical scenes in the drama.“Orange Marmalade” is aired on Friday at 10:35 p.m.By Lee Hye-won ()