Traveling Through Time to Become a Pilot but Loving the Light World

A student who died young due to an accident was reincarnated and lived in a happy family. Unfortunately, the war destroyed this family. A young man who matured precociously because of the war, confused and eager for revenge, died in a secret mission. I don't know whether it was misfortune or relief. He woke up again and came to a happy family. This time he had knowledge from the future, skills from the battlefield, and a partner who accompanied him through time. This time, he would not let another family member die in front of him... To my parents and sister: What is... Urging marriage? To my childhood sweetheart: What is... A heartless person?