Memories of the Alhambra

After receiving an email regarding a groundbreaking AR game about medieval battles in the Alhambra, Yoo Jin-woo (Hyun Bin), CEO of an investment company that specializes in optical devices, travels to Granada, Spain to meet the creator of the game, Jung Se-joo (Park Chan-yeol). However, Se-joo has gone missing and there, Jin-woo meets Se-joo's older sister, Jung Hee-joo (Park Shin-hye), who is the owner of the hostel he stays in and a former guitarist. Both get entangled in mysterious incidents, as the border between the real world and the AR world built by Se-joo begins to blur.