The Assassin Demigod by TheFangirlingLeopard

https://aztruyen.top/tac-gia/TheFangirlingLeopard

Cain's a girl with a mysterious past who works as an assassin. Word of advice: don't get on her bad side. One day at work she sees some weird people and is dragged into the world of Greek gods and goddesses. Turns out, she's the daughter of some very powerful immortals...