Duan Wenning visits the city of Iga, which used to be home to ninja practitioners. Ninjas were highly trained people who served as spies and bodyguards for VIPs in feudal-era Japan. They were experts in handling special weapons such as throwing-stars and gunpowder and had state-of-the-art knowledge of the latest scientific developments. Duan, donning a ninja costume, tries her hand at the rigorous physical training ninjas used to conduct deep in the mountains and then takes a unique selfie.