Wait, Why Hasn’t the Original Host Been Eliminated?

Song Langyu transmigrates into a book, becoming an unnamed demon cultivator who is destined to be sacrificed at the very beginning of the original story. It’s bad enough that he opens his eyes to a crowd of cultivators trying to kill him. Getting swindled by a useless System and saddled with over a hundred million in debt is bad enough, too. And transmigrating more than ten years early, with the entire main plot taking place much later, is... well, he can accept that, too. Faced with all this, Song Langyu closes his eyes and chooses to accept his fate. What else can he do, if not accept it? After finally escaping his pursuers, he thinks he might get a moment of peace. Then he looks up and sees a sinister figure crouching above him. It’s like walking straight into a ghost. Song Langyu scrambles to his feet and asks, “Who are you?” The other person scoffs. His icy voice rings out at the same time as the System’s startled cry: “You stole my body, and now you’re asking who I am?” [Wait! Why hasn’t the original host disappeared?!] Song Langyu: “...?” Song Langyu wants to hang the System up and beat it. What a useless System! I take a few steps back, and you really think you can walk all over me?! - After being scolded by the original host, the useless System flees for the whole night. When it returns, it announces: [After a long night of deep reflection and discussions between the System and **, we’ve finally decided...] [To bind the original host as well!] Not only that, it also ties a red thread around the two of them. Song Langyu asks, “What does the mute function mean?” He looks down at the thin red thread around his ring finger, like a ring. “And what is this?!” The System says nothing, only wishing them a harmonious relationship. Then it runs off after using up all its energy. - Question: What should you do if the System arranges a marriage between you and the original host? Answer: The two of you should fall in love all over again, passionately. - P.S. ● 1v1, both virgins, happy ending. ● My take on cultivation, with original worldbuilding running wild across every page. ● Probably a story about an arranged marriage (though technically it isn’t), raising a child, and a makeshift family that’s sometimes chaotic and sometimes blissfully harmonious, before the unexpected happens: one partner leaves, and both the other partner and the child are heartbroken. Then they reunite and find happiness again, falling in love all over again? ● Important point: [The child is adopted.] Adopted. Adopted. ● There’s very little child-rearing in the story. It mainly focuses on the main couple, so don’t worry, the child won’t steal the spotlight~ Theme: Freedom, equality, and justice