During the era of the republic, the town of Changsha was guarded by nine big families known as the “Old Nine Gates / Mystic Nine Clan”. They were incredibly powerful families who wield supreme power over everything in Changsha.
In year 1933, a mysterious train ended in Changsha station. The leader of the Nine Gates, Zhang Qishan (William Chan) who was also the army commander of Changsha, started to investigate with Qi Tiezui (Ying Haoming) and they discovered a highly suspicious mine just out of Changsha. In order to solve the mystery of the mine, they decided to engage the help of Er Yuehong (Zhang Yixing) who was an opera singer that came from a family of archaeologists. However Er Ye was reluctant to help them as his wife Ya Tou (Crystal Yuan) was terminally ill. In order to procure the medicine for treating her, Fo Ye travelled to Beiping with Er Ye, Ba Ye and Ya Tou and they met the young mistress of the hotel Yin Xinyue (Zhao Liying) there. The five of them later returned to Changsha and discovered the how the mystery of the mine was connected to their families’ histories and the Japanese’s sinister plot against Changsha.