I Became the Villain's Trainer

Also known as: Heungmakdeurui Joryeonsa-ga Doeeotseumnida, 흑막들의 조련사가 되었습니다, 幕後黑手的馴獸師, 狼犬男主的驯养师, Le Tyran apprivoisé, 黒幕たちの調教師になりました

by TLB, 91, Rin-A

When veterinarian Yoohee Han dies early, a grim reaper sends her into the world of a novel she once read to live out the rest of her time as the side character Alexa. She uses her knowledge of the novel (and of animals) to take on a more prominent role as the trainer of Isildus, heir of Terrecion, a wolf shifter who will remain in animal form until his 16th birthday. She becomes a beloved advisor in Terrecion castle, and her actions change the fates of other characters. How will little Issy feel about her when he becomes human? (Source: Tapas)