Jia Ruicheng, the chief restoration engineer of Mutianyu Great Wall! Whenever there's restoration work, Jia is there, right in the mix. From laying pipelines and building water reservoirs to repairing watchtowers, walls, and pathways, he’s done it all. Day in and day out, Jia has been dedicated to preserving the Great Wall. In 2009, at 49, with his wealth of experience and solid skills, he became the chief engineer of Mutianyu Great Wall, leaving his mark on every corner of this historic site.