You Are My Sunshine(2005)

Overview:

An old bachelor Seok-joong, who has no experience in dating, falls in love at first sight with a prostitute named Eun-ha. At first Eun-ha shows no interest in Seok-joong, but gradually she begins to be flattered by his devotion and eventually falls in love with him. They marry. However, one day, Eun-ha finds out that she is infected with HIV and decides to leave Seok-joong.