9 parts Ongoing Diego has lived most of his life with a diagnosis hanging over him: emphysema, a rare disease that makes each breath a struggle. At 19, he learns he has only three months left, a brutal countdown he faces with resignation. But when his childhood friend, Mark, moves back into town, Diego's world is turned upside down. Once inseparable, the two boys had been forced apart when Mark's family moved to the city twelve years ago. Now, Mark is back, and they're even sharing a roof-a twist of fate that rekindles memories and feelings Diego had long buried.
As their friendship deepens, Diego and Mark discover an undeniable connection that goes beyond friendship. Despite the ticking clock and Diego's fading health, they fall quietly, deeply, and hopelessly in love. But with Diego's future so uncertain, they decide to keep their love a secret, protecting their fragile moments together from the outside world.
In the midst of pain, laughter, and stolen glances, Diego learns what it means to truly live-even as his borrowed heartbeats begin to slip away.
This title conveys the precious, limited time Diego has left and the intense love he shares with Mark, making each heartbeat feel borrowed and meaningful. It hints at both the beauty and tragedy of their relationship.