The Old Men of the Long River

Zhao Ge, a history graduate student, transmigrates to the end of the Qin dynasty and accidentally drinks the elixir of immortality. From then on, he lives through the Qin dynasty all the way to the Ming, spending two thousand years bidding farewell to every person he has ever known. It is only on the night Chongzhen hangs himself that Zhao Ge understands: immortality is no gift, but the longest goodbye in the world.