Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 1 - 1-2. Written Dream Read as Ephemeral

The Republic of San Magnolia.

After dying from betrayal, Thomas reincarnates as Jolthar Kaelzhar, the neglected son of a powerful clan, just after his brothers kill him. With Jolthar's memories and the blessing of Qalena, Thomas vows to rise from his lowly position and claim power in his new life.

Asura, a noble in the kingdom of Silvara, spent his days quietly until his world ended. Betrayed by his beloved wife and then killed, he swore to get revenge on them in his late moments. Upon death, Asura somehow returned 20 years into the past. Prepared to get revenge on the woman who betrayed him.On his journey for revenge, he discovers true love, friendship, and a life-altering truth.A dark cult controls his fate like a game—even his beloved's betrayal was their work. He learns about his powers and strange bloodlines. Then, about this being his ninth and final rebirth! All to revive their god, using Asura as the perfect vessel.Vowing to destroy the cult's plot and protect his loved ones, Asura forges an alternative path.Becoming the Devouring Monarch

Opening his eyes he finds himself in the unfamiliar ceiling scene.

After going through the body's memories he finds that he transmigrated into a cultivation world.

But there is a problem;

Why is everything around him look like a flag that he is the young master who gets killed by the child of the plane a.k.a. the MC?

How would he implement his try not to die plan?