TV Novel: Big Sister

The drama about the lives of three sisters after they lose their parents. In Ok is the sister who will do anything for her sisters. In Ok finds out that her younger sister, In Soo, has given birth to a daughter out of wedlock. In Ok, being the unselfish sister that she is, is left to take care of In Soo's daughter while In Soo is in Germany pursuing her dreams of becoming a doctor.
(Source: DramaWiki)