The only thing I remember is that the female protagonist transmigrated to ancient china with a dash of fantasy (coz she had an affinity with sacred beasts or something) and is tasked to save a humongous amount of souls to expand her lifespan. If I remember correctly, she did something wrong in her past life so she has to atone by saving lots of people so the body she has can live past a certain age as well. MC: Merchant’s daughter? Known by the people to love buying and collecting people but she releases them once their contract expires or if they want to leave.