Kuromaku Ouji to no Soine wa Himitsu desu

Reincarnated as Olivia, a minor noblewoman in a deceptively titled tragic romance, “The Tragic Crown Prince’s Overwhelming Love," she aims to prevent her favorite characters' misfortunes by stopping the mastermind prince's death. To save her favorites by uncovering his secrets, Olivia becomes mastermind prince Crios' maid, but her actions lead to a massive misunderstanding with Crios...?! Crios: "Th-This... could it be... a confession of love...?" A fluffy and lovey-dovey master-servant romantic comedy woven with misunderstandings and missed connections starts here!

Original Webtoon:
LINE Manga, eBookJapan