The Game's Extra: Azhriel Odyssey - Chapter 3: When The Legends Falls-

When he woke up, Xiao Junlin transmigrated into the novel he was reading, but he was not the protagonist, but the male partner’s father, who was still a licking dog.

“I have ruined your reputation for the first time. From today, my son will be relieved of all positions in the group.”

“Ding, the host cuts off the relationship with his son and gets a reward of twenty years younger.”

“Don’t call me uncle, the stinky girl only knows how to use my son. Starting today, you will be demoted and go downstairs to clean the toilet.”

“Ding, the host successfully suppressed the heroine, and obtained god-level investment skills and god-level fighting skills.” Killing the dog, suppressing the heroine, and winning the protagonist’s creation, Xiao Junlin found that he was gradually approaching the peak of his life. …

- Description from novelbuddy

Shen Qingxian is the Honored Lord Lianhua, only lacking ascending to the heavens.

Gu Jianshen is the Demonic Emperor Jiuyuan, only lacking destroying the three worlds.

Everyone believed that a meeting between Shen Qingxian and Gu Jianshen must result in a war spanning the three worlds, the two of them dueling to the death.

Until Shen Qingxian went through a hundred years of closed-door cultivation, and spied upon heaven’s mysteries.

Words of heaven’s mysteries: For ten thousand years, no one in the cultivation world has ascended to the heavens. This is because the Heavenly Staircase has long since collapsed. The only way to set this right is to follow the directions of this jade scroll.

Jade Scroll Writing: First, meet with Gu Jianshen. Second, drink and get drunk together with Gu Jianshen……. Thirteenth, pass a ‘spring night’ together with Gu Jianshen…….

Shen Qingxian: “……”

- Description from Novelupdates

He once stained the rivers and mountains with blood, his brilliance unparalleled. Unexpectedly, he encountered a great calamity, a dragon trapped in shallow waters, everyone thought he was nothing more than a useless son-in-law. But how could Gold Scales belong to a mere pond? The returning king, under the name of Frenzied Son-in-Law, with the War God’s stature, swept across the Eight Desolations of the Four Realms, the world trembled beneath his feet!

An alien race invaded the Earth on June 6, 2128. At the midst of this war, many nations allied with the alien threat and the war nearly wiped out the rebelling humans of the planet. At the edge of mankind's survival, the United Nations Army launched its forces to eliminate the immediate stellar threats that loomed over Earth.

General Seeker Carlean, commander and leader of the mission, risked and gave his life to destroy the immediate stellar threat. The battle was won though Earth lay in ruins. Perhaps mankind will live to see a few years of peace before the alien threat returns to wipe out their existence.

At the immediate aftermath of the stellar battle, the fallen Seeker Carlean awakens and finds himself at aged 17, living the peaceful life he lived 16 years before he died.

So begins a new game in the battle for humanity's survival.