The Zhuxian Son-in-Law, Husband of the Myriad Worlds

(Male-to-female) + (soul transmigration) + (gender swap) + (System)

After modern office worker Shen Yijia dies from overwork, his soul transmigrates into Su Qingyan, the abandoned legitimate daughter of a marquis's family in the Great Jing Dynasty. At death's door, she is unexpectedly bound to the "Immortal-Slaying System," her only means of survival in a perilous ancient world.

From escaping a ruined temple to returning to the marquis's residence, she uses her peerless beauty and modern knowledge to unravel family power struggles and her stepmother's deadly schemes, while relying on the System to embark on the path of cultivation. Along the way, she meets Ye Xuanyuan, a mysterious powerhouse who can travel between countless worlds. Handsome and powerful, he can open a space-time portal with a flick of his finger, and is intensely curious about her secrets and her strangely tenacious nature.

While seeking the truth about her mother's death, she enters the martial world and gets caught up in a dispute over "fragments of time and space." Her mother's death turns out to be connected to the fragments, which are also the key to Ye Xuanyuan's efforts to repair the world and the source of turmoil across countless realms. They go from testing one another to fighting side by side, venturing into a martial arts world to find a rare elixir and into a technological plane to explore its civilization. As they repeatedly risk their lives together across time and space, affection quietly blooms between them.

When the mastermind, the "Xuantian Sect," and the traitors from another world behind it finally emerge, intent on seizing the fragments and destroying countless realms, Su Qingyan has already grown powerful enough through the System to wield the "Immortal-Slaying Sword Domain." She and Ye Xuanyuan rally allies from across the heavens and worlds, turning the tide in the rifts of time and space. In the end, they use the "Core of All Worlds," formed by fusing the fragments, to put an end to the crisis.

With the dust settled, she gives up her identity as the marquis's daughter and accepts Ye Xuanyuan's proposal. Witnessed by the beings of countless worlds, a bond that began in flight becomes a marriage spanning time and space. From then on, with the Immortal-Slaying Sword as their blade and all worlds as their home, their journey is only just beginning.