Transmigrate into a book + sweet romance + heroine's halo + a Mary Sue story that's not too Mary Sue
[An unhinged monster male lead with no concept of good or evil vs. a beautiful, slightly clever female lead]
[Not a strong, independent heroine. She'll unlock combat skills later on, but the male lead will still be overwhelmingly powerful]
Sang Yan transmigrates into a book, landing in a horror novel she had just started reading yesterday and hadn't even gotten through three chapters of. She becomes an unnamed passerby.
She only remembers that the male lead in this book isn't human. He's ruthless and decisive, seemingly harmless but secretly cruel, and will kill anything he isn't interested in without hesitation.
Unfortunately, the moment Sang Yan opens her eyes, the male lead is standing nearby.
She trembles as he lazily raises a hand, ready to give her a quick death.
At the last possible moment, the System appears. “There was a transmission error. You weren't the person we originally selected. But there's no way for you to go back now, so after discussing it, we've decided to give you a life-saving skill.”
In this place crawling with monsters, where the slightest mistake could cost her life, Sang Yan knows her limits and chooses to max out her defense skill.
The System says, “Host can be reborn any number of times. Note: No side effects, no painful memories. A System product is guaranteed honest and reliable.”
Sang Yan: “...”
How is that a defense skill?!
But the System disconnects and leaves the world without giving Sang Yan any chance to object.
When she turns around, the male lead kills her.
When she opens her eyes again, Sang Yan is alive once more.
