I don't think we can say for certain that it's based on a well - known true story. Just because the title gives the impression of being based on something real doesn't mean it's a widely recognized true account. It could be that the creator has taken elements from various real - life situations and blended them into a unique story. For example, they might have taken the idea of a place with a strong religious presence (the saints) and added the concept of those who deviate from the religious norms (the sinners), but these elements could be drawn from different real - life settings that are not well - known in a general sense.
I'm not entirely sure as I haven't delved deep into it. But it might be about the complex relationships and events that occur in a place filled with good and bad people, perhaps exploring moral and ethical themes within that setting.
It depends. Sometimes a story labeled as 'Saints' might draw inspiration from real events but have fictional elements added for entertainment. So, it could be a mix of truth and imagination.