Don't Mess with My Sister — Episode 16

A gentle, illegitimate heiress suffers abuse from her husband's family. Upon her wealthy father's death, she becomes the sole beneficiary. Her husband plots to kill her via a lookalike hitwoman. A struggle ensues, identities are swapped. The tough hitwoman helps her reclaim the fortune. They discover they are twin sisters, teaming up to expose the truth about their parents' deaths and seek revenge.