Into the light once again

Reading manhwa Into the Light Once Again / Once Again Into the Light, Alone / 再次遇见光明 / 再见光明 / 遇光重生 / 다시 한 번, 빛속으로 / 다시 한 번,빛속으로

Summary:

I was falsely accused of attempting to kill my younger sister, who was worshipped as a Saintess.
There was not a single person who believed in me, nor was there a person who stood up for me.
Not even my blood-related family.
I was 14 years old, and it was winter.
I, who was Edenbell's Fourth Princess, was miserably beheaded in front of the masses.
After the end of my death, I awoke and what came was...
"My baby, my precious younger sister."
With a delightful smile, he held my small fingers.
That warm gesture, warmth, and touch.
He sang me a lullaby as he held me gently and swayed.