Read manhwa The Golden Light of Dawn / 황금빛 여명이 너를 비추리
You’re still precious to me. After losing her family in a demon attack, Rosha is reborn as the 777th most powerful magic knight in the Golden Dawn Society. To avenge her family, she trains hard and rises through the ranks against the odds. Then, she is tasked with protecting little Joshua, who is said to be the Child of God.