And I Love You So revolves around the lives of Joanna (Miles Ocampo) and Trixie (Julia Barretto), who will find themselves pitted against each other in everything they want. They become bitter rivals in school, and even in love when they fall for the same guy – the internet sensation Justin (Iñigo Pascual).
Their rivalry intensifies and becomes more complicated when they are forced to live under one roof as stepsisters. Their lives change when their parents – Joanna's mother Michelle (Dimples Romana), and Trixie's father Alfonso (Tonton Gutierrez) – unexpectedly meet again. After years of being separated from each other, Alfonso takes his chance to ask Michelle, his true love, to marry him amidst the disapproval of Trixie.
But as they start to live their lives anew as one family, Katrina (Angel Aquino), Trixie's mother and Alfonso's first wife, returns after having abandoned both of them years ago without explanation. Now that she's back, Katrina is determined to win back everything Michelle took away from her: her husband, her daughter, and her wealth.[6]
Miles Ocampo as Joanna R. Valdez - Michelle and Alfonso's daughter, and Trixie's half-sister. The main female protagonist and antihero. She is intelligent, kind, and has determination to fight for what she believes in, including her identity surrounding her father.
Julia Barretto as Patricia "Trixie" C. Valdez - Katrina and Alfonso's daughter, and Joanna's half-sister. The main antagonist of the series, and later protagonist in the end. Trixie becomes more cunning, deceitful, ruthless and manipulative after her mother makes her believe that Joanna and Michelle are a threat to their family. Later revealed that Dexter is her biological father.
Dimples Romana as Michelle Ramirez-Valdez - Alfonso's real love interest and later his second wife. She is Joanna's mother and Katrina's former best friend. She is the main female protagonist of the series.
Angel Aquino as Katrina Cervantes-Valdez - The first wife of Alfonso and Trixie's mother. She is the ex-best friend of Michelle. She later died with Dexter in a cliff. She is the main female antagonist, and later protagonist in the end.
Tonton Gutierrez as Alfonso Valdez - The ex-husband of Katrina, current husband of Michelle, and Joanna & Trixie's father. He was later killed by Dexter.
Jay Manalo as Dominador "Dexter" Eustaquio Jimenez - Katrina's ex-lover and Trixie's biological father. He is the adopted son of Andres Jimenez. He is the final antagonist of the series.
Initially meant to be part of Primetime Bida evening block, And I Love You So was originally planned to replace Pasión de Amor in early 2016. However, in a last-minute change, the timeslot ended up downgraded as part of Kapamilya Gold afternoon block, after the network decided to immediately end Walang Iwanan on December 4, 2015, due to low ratings and lack of support.[8] The schedule time is after Tubig at Langis.