SSS Ranked Awakening: I Can Rewind Time! - Chapter 33: In Five Breath’s Time.

After accidentally falling, she actually finds herself bound to a Second Female Lead Counter Attacking System!

In the foreign world, the martial artists dominate the world and the sword of the emperor controls the fate of hundreds of millions of lives! Long Yu, the number one killer on Earth, after dying, takes rebirth in this new world in an aristocratic family of martial artists but faces rejection because he is unable to practice martial arts.

- Description from Novelupdates

In the 21st century, she was the strongest bounty hunter who possessed supernatural powers and was proficient in brewing all types of potions. However, she becomes the first talentless child of a cultivating family when she transmigrates.

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.