The Sixteen Guardians of Yanyun

An engineering PhD transmigrates into the body of the heir to the Prince of Zhenbei in Youzhou. Just after he is assassinated and “comes back to life,” his father sends him on a journey to investigate his mother’s death. His maid turns out to be the daughter of the former lord of Youzhou City. Over the next three years, he uses his wits to survive repeated attempts on his life and grows closer to the maid, but then another assassination attempt strikes. After the maid sacrifices herself, she comes back to life when the soul of the Great Jin Emperor, undergoing a lightning tribulation, transmigrates into her body. His investigation reveals that his mother’s death leads straight to the imperial family. He returns home and pretends to be a wastrel; after paying his respects at his mother’s grave during his coming-of-age ceremony, he and the maid enter one of the four great sects to cultivate. Breaking through to the Spirit Condensation Realm triggers celestial phenomena and activates the System, which tells him he must dual cultivate with sixteen women to become an Earthly Immortal. But the royal family and villains are trying to kill him, and his father, the Prince of Zhenbei, turns out to be the author of this very book. No one knows how the story will unfold.