In one sentence: This is the story of a young man who keeps transmigrating through different times and places, eventually completing his mission, making the System his own, and then continuing to wreak havoc in the world. The story is mainly about what happens afterward.
Warnings (the author doesn't think so, but I do, and you might not):
1. The protagonist is the bottom. Since he has transmigrated through multiple worlds before, he's very powerful.
2. It's seriously indulgent, so it might not be for everyone.
3. One-on-one. You have to trust the author's integrity.
4. The top and bottom's personalities... looking up at the sky, even the author doesn't know.
I hope I won't disappear after writing this article.