The first is a completed novel—Gender Transformation: Reincarnation Realm.
This is a highly mind-bending sci-fi novel involving time machines, worldlines, and more. The later stages feature spacetime travel, so it will require some serious brainpower.
Synopsis:
The protagonist, Su Yuan, turned into a girl overnight. With no other choice, she adapted to life under her new identity. But just as her life began to settle down, an even greater storm arose—Su Yuan and the others accidentally discovered a special signal within the jade gemstone she wore. After deciphering it, they obtained spacetime theory. Just as they created the Worldline Sniffer and prepared to begin researching a time machine, an accident occurred.
At the critical moment, Su Yuan suddenly discovered that she possessed the ability to briefly turn back time.
To save those around her, she repeatedly used her ability to turn back time and leap across different worldlines. Yet history's stubbornness always disappointed her. Until Su Yuan returned to her hometown... and was shocked to discover that there was actually a time machine in her family's basement...
The novel is tightly interconnected from beginning to end and focuses on plot details. The first few hundred thousand words primarily lay the groundwork, the middle portion enters the main storyline, and the later portion wraps everything up. The entire story follows a single thread.
Note: Gender Transformation: Reincarnation Realm has just been released from moderation. To avoid being locked up again, I revised more than a hundred chapters, shortening the total length by thirty to forty thousand words. So... it is still better to read it on Qidian.
The second book is an ongoing sci-fi novel—Super-Cosmic Civilization.
This is hard sci-fi that emphasizes the objective development of physics. At least, I think it already qualifies as hard sci-fi.
Synopsis:
Earth is