In the present-day, Jack, an archeologist, is the reincarnation of Meng Yi, as he often dreams about his past life. One day, his friend William invites him on a quest to hunt a rare material that can create a field of zero gravity. They travel to a floating tomb of a Dassar king in India, where Jack finds a sword and has a recollection of a duel he had with the king in his past life. William accidentally removes a piece of the material and the zero gravity field collapses, destroying the tomb. William manages to escape but Jack leaps off a cliff and falls into a river. He loses consciousness and drifts along until he is saved by a woman named Samantha. Later, Samantha brings Jack to see her uncle, a Kalaripayattu guru, who enlightens him about his past and future. Jack succeeds in returning home safely and he delivers the sword to the National Museum of China as a national treasure. His action angered the leader of the secret organisation that has been funding Jack and William's treasure hunt.
After extensive research, Jack and William conclude that the anti-gravity material is actually fragments of a meteorite that fell to Earth during the Qin Dynasty. They find the exact location of the Qin emperor's mausoleum, concealed behind a waterfall. The massive tomb contains the strongest fragment of the meteorite, which is powerful enough to make the tomb become a floating palace. Jack meets Ok-Soo and Nangong Yan inside the tomb and they mistake him for Meng Yi. Just then, a group of intruders led by the organisation's leader enters the tomb and they attempt to seize the immortality elixir, culminating into an aerial fight between the two parties. William accidentally breaks the balance of the field after removing a piece of the meteorite and causes the tomb to collapse on itself, and dies after drowning in the mercury river. Jack escapes from the collapsing tomb, asking Ok-Soo to come with him, but she refuses after realising that Jack is not Meng Yi. Before the film ends, Jack is seen writing a book about his experiences, which he dedicates to William.