Reborn: The Dragon and Phoenix Reversal

After a shipwreck, an uncle and his niece transmigrate to ancient times, with their genders reversed and their bodies swapped. Though they appear to be noble, they are constrained at every turn. How can they reclaim everything that rightfully belongs to their bodies? But when they finally reclaim what they thought was theirs, another disaster strikes. One dies, while the other barely survives. Their genders return to normal, and the dragon and phoenix return to their proper bodies. There is scheming within the manor and confusion all around them. Who is pulling the strings behind it all? What is the truth behind the strange events they encounter? Can the last survivor make it through this web of mysteries, and will they be able to unravel the tangled riddles one by one?