Quick Transmigration Stories About Background Characters, With Possessive Love Interests

I want books like *Quick Transmigration: The Male Lead Keeps Clinging to Me*. Don’t recommend quick transmigration stories where the heroine pursues and wins over the target. It feels like she’s throwing herself at him. Also, nothing too long, preferably no more than 30 chapters. That’s my limit. And don’t recommend stories with a huge gap in status, like “