Lothar and Muna meet through mutual friends. Despite an instant attraction and undeniable chemistry, they both resist falling in love due to their respective families: Lothar, an epidemiologist with a wife and two daughters; Muna, a married businesswoman with a son.

Their forbidden love blossoms through passionate, yearning letters, where they express their deepest feelings and share their dreams and fears. Aware of the consequences that their relationship would bring if revealed, they cling to the escape they find in each other's words, finding refuge in the intimacy of their correspondence.

Lothar's life takes an unexpected turn when his work as an epidemiologist leads him to discover the looming threat of a global pandemic. Forced to travel the world to investigate and contain the crisis, his correspondence with Muna intensifies, marked by the uncertainty of the future, leading him to question whether it's worth denying such a true love when everything could end so soon.

Years later, their children, Toby and Lily, meet in a café. They had discovered and secretly kept their parents' letters, uncovering the clandestine love story that shaped their lives.

Moved by their parents' passion and sacrifice amidst a pandemic they vaguely remember from their childhood, Toby and Lily decide to honor their memory by giving their story a meaningful ending.