Seirei Tsukai no Blade Dance - Elemental Festa, Chapter 3 - The Princess’ Confidential Part-time Job

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

She was once an heiress, but later her family went bankrupt, and her fiancé betrayed her. Besides, she had to bear the expensive medical expenses of her brother. Therefore, to regain everything, she decidedly married her ex's cousin in a deal. Initially, he was very aloof and didn't care about women at all, but he gradually fell in love with her, protecting her and supporting her...

If I were to fall into a game, I wish I would fall when I was young.

The Blood Warrior of the Ungpae Association, who created a sea of blood wherever he went, made the world of the Forces of Evil possible.

The Nine Great Sects and the Six Great Clans joined forces to fight him, but were unable to stop him.

Four Great Warriors, who were Murim’s last hope, appeared.

The four of them fought against the Blood Warrior and eventually defeated him at Mount Song.

The time has come for the legacy of the Blood Warrior to rise once again.