Ako ba ang nasa puso mo?

Abraham's wife dies in a hospital after giving birth to a son, Ariel. Abraham (Abe) is the head of a household. Biring, a housemaid, gave birth to a girl (Theresa) shortly after a few months. Theresa and Ariel grew up together. One day, Theresa's parents left for the province due to illness in the family. Theresa's parents shortly die from a passenger bus accident. Chayong, Abe's sister, sent Theresa away with her Aunt. Theresa grew up with her Aunt. Her Aunt is a prostitute and has financial difficulty. When Theresa turned 18, her aunt wants her to work as a prostitute as well to help with the finances. This prompted Theresa to run away and ended back in Manila where she was re-united with Ariel and his family.