Gyeong-ah works as a caregiver and lives alone. The only one she can rely on is her daughter, Yeon-su, but it's hard to see her after she moved out on her own. Meanwhile, Yeon-su, who is suffering from her ex-boyfriend, Sang-hyun, argues with him again and visits her mother’s house. After Yeon-su left, Gyeong-ah receives a shocking message from a stranger.。理查德·哈蒙德带领观众一起对世界上那些最具野心的标志性建筑进行了一次深入探讨,从基本的构造开始逐步展现一项技术是如何成就这一伟大工程的。理查德造访了所有奇迹般的的建筑并找出个令人惊诧的工程技术遗产,而没有这些技术,所有的建筑都不会得以实现。通过大型模型展示,专家的解说, 理查德对每个关键技术调查研究。