Kailan Ka Magiging Akin (English: When Will You Be Mine)[1] is a 1991 Philippine melodrama film directed by Chito S. Roño from a story and screenplay written by Mia A. Concio, inspired by the sensational real-life criminal case.
The film stars Janice de Belen, Gabby Concepcion, Eddie Gutierrez, Charo Santos-Concio, Vivian Velez, Gina Alajar, Julio Diaz, Carmina Villarroel, and Cherry Pie Picache, and child actress Lady Lee.
The theme song of the same name was performed by Dulce, with compositions by Nonong Buencamino and lyrics by Jose Bartolome.
From birth to childhood, little Mariel became the central point of the heated court battle between the people who were worthy of taking care of her.
Mia A. Concio wrote the film's story and screenplay and this was her last written work before she went into a hiatus from screenwriting until 2000.