I saw this asked on Goodreads a lot when I first picked it up. 'My Miracle Luna' is definitely a work of fiction—it's a werewolf romance serial from apps like Dreame or GoodNovel. Those platforms are packed with stories following that specific mate-bond/rejection trope. The core premise, with the Luna being fated but underestimated and the Alpha's internal conflict, is a classic setup in the genre.
That said, the emotional beats can feel real because they tap into universal feelings of betrayal, proving yourself, and earning respect. I remember reading a scene where the main character is publicly humiliated at the pack gathering, and even though I know it's not real, my heart was pounding. The author might draw on real emotions or common relationship dynamics, but the plot with shifting, pack politics, and magical bonds is pure fantasy. So, no true story basis, but the feelings it evokes can be genuine enough to make you stay up too late finishing it.