Nae Aiga Bunmyeonghae

After a one-night stand with Duke Klauzner, Baroness Claire Delford flees the capital when her sweet sister Elisa gets caught up in a dangerous political conflict. Five years later, Claire stirs up high society when she returns with her nephew, Elliot. Despite her adamant denial, everyone believes Elliot to be the duke's son. Can Claire clear up the misunderstanding and protect her nephew from scheming nobles? And does this mean she has to join hands with the prideful Duke Klauzner to do it?

(Source: Tapas)