The Boy I Loved Became the Jaded Emperor
無口な公爵令嬢と冷徹な皇帝 ～前世拾った子供が皇帝になっていました～
Synopsis
After witnessing the death of the woman who saved him as a child, Prince Alexei vows revenge and turns bitter and jaded, eventually taking the throne and becoming Emperor. Little does he know, the woman who saved him was reborn as the daughter of a duke, a taciturn young lady with a secret. When fate throws them together, will they recognize each other, or will their jaded pasts keep them apart?
(Source: Kodansha USA)
