Well, it's a bit of a mix. The author might have drawn inspiration from various real-life experiences and combined them to create the fictional narrative of One Day. So, it's not strictly based on one single true story.
It's popular because it has a compelling romance, interesting character interactions, and beautiful illustrations. Plus, it tackles themes that resonate with many readers.
The popularity of this BL manga could stem from a combination of factors. Maybe it has unique plot twists, relatable emotions, or beautiful illustrations that capture the essence of the story. Also, the chemistry between the characters could be a major appeal.
There were a few novels that could be recommended, including " The Swapped Daughter Reborn "," On the Day of the Annulment, I Was Carried Home by a Ruffian Husband "," On the Day of the Annulment, I Married a Wealthy Family to Raise My Children "," On the Day of the Annulment, I Turned Around and Provoked a Fierce Prince, Unable to Escape ", and so on. These novels all involved the plot of the protagonist breaking off the engagement on the day after his rebirth.
I'm not sure specifically what the stories in Ms Titus' day off in MC are as there's not enough context. It could be about her adventures, things she does for relaxation, or encounters during her time off.