Plot synopsis: Para Sa Isa’t Isa centers on the compelling story of Zion Magtibay and Erin Revina, who start off as spirited high school rivals. Their relationship evolves unexpectedly into love, leading to marriage. However, ten years into their union, a fiery disagreement results in their separation. In a desperate bid to mend their fractured relationship, Zion makes a wish at a magical wishing well to turn back the clock. Miraculously, he wakes up ten years earlier, before he met Erin, setting the stage for a heartfelt journey of rediscovery.