Watashi wa Tada no Jijo desu node Hissori Kurashitai no ni, Kishi Ousama ga Nigashite Kuremasen

Elaina was a queen who died a tragic death in her previous life. In this life, she was born as the illegitimate daughter of a certain nobleman, and although she was treated coldly, she was relieved that she could live without attracting attention. However, one day, her hidden magical powers were discovered by Asuno, a handsome genius knight... A chase love romance between the most powerful young lady who lived a quiet life and the deceitful knight king!

(Source: Kadokawa, translated)