The Nun 39-s Secret Manga

The Nun's Secret " appears to be a romance story (often shared in serialized "episodes" or as a web-story/manga format) that follows Sister Sophia

While there isn't a widely recognized official manga titled "The Nun's Secret," there are several stories with very similar titles or themes. Based on the most common results, you might be looking for one of these: Likely Matches The NUN Secret the nun 39-s secret manga

The conflict begins when Alex returns to the village. Having found that his life of urban wealth and luxury was hollow—and his marriage to a manipulative woman was a failure—he seeks Sophia’s forgiveness. The Nun's Secret " appears to be a