When Bad Bunny invited Belinda on stage during his Puerto Rico residency, fans weren't sure if they were witnessing just a concert - or the beginning of a story that felt destined to happen. It wasn't a simple improvised duet. It was the meeting of two artists whose connection had started years earlier, when Benito Antonio Martínez Ocasio, a Puerto Rican kid, listened to Mexican pop and dreamed of fame. The five-year age gap between them is hardly significant, but Belinda - the Spanish star with Mexican roots - rose to stardom first.