I Became The Wife Of The Monstrous Crown Prince is a Manga/Manhwa/Manhua in english language, Adventure series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

She transmigrated into the body of Ancia, the current wife of the monstrous crown prince, Blake, in an R-19 romance novel. In the original story, Ancia committed suicide on the day of their marriage, leaving Blake with massive trauma. But this time, Ancia wouldnt do such a thing. Blake was the second male lead in the original novel. He was portrayed as a beast that possessed an exquisite facade. Yet, right now, he was behaving just like an innocent rabbit. The only person who can remove the crown princes curse is the heroine, Diana. My role is to just keep this little boy from getting hurt and then step down in time, but.. Ancia, dont leave me! This little rabbit keeps chasing me.