DISCLAIMER: Although PBD is very well written novel that pulled me and many others out of reading slump because of how captivating it is, it is NOT for the faint of hearts. If you are looking for a sweet love story, you should just walk away and read something else. The ML is NOT a good guy, the MC loves him nonetheless. If you have low tolerance for assholes ML, you should just save yourself the trouble of reading because the story will simply make your blood boil and you will hate reading this. ಥ_ಥ
However, if you have high tolerance for assholes ML and you are looking for an angst-filled and character-driven story, PBD is very enjoyable. It is questionable and debatable among readers whether the scum ML has redeemed himself in the second arc of the story, so I'm also warning that ending may NOT be satisfactory depending on one's subjective opinion. ╮(╯_╰)╭
But reading this might color your viewing experience of the ongoing series (the novel is THAT well-written), so I highly recommend you consider your ability to separate the novel from its adaptation because it's better to have manageable expectations for better viewing experience. You can also read PBD after the series end as well.
Here are some content/trigger warnings: ABUSIVE lover, noncon sex, house arrest, wife-chasing crematorium, scum male lead, dog blood drama, regret + misunderstandings
You can read it here if you decided to start reading. ƪ(˘⌣˘)ʃ
Link: https://rosyspell.wordpress.com/rebirth-the-unique-substitute/
Note: DON'T read the extra chapters at the prologue part, they're meant to be the last chapters but the translator put it there. You should start from chapter 1 onwards. Happy reading (´▽`ʃ♡ƪ)