Unknown Invasion: Calamity on the Eighth Day

[From the start, Cthulhu, power fantasy, transmigration, decisive and smart protagonist, game, multiple heroines] Yue Lin transmigrates into the game Calamity Week Eight. The original owner was a bottom-rung wage slave and a pathetic simp, but Yue Lin knows his true identity: the only son of the Luoshen Empire. After taking a paternity test with the emperor, he rockets to success and experiences things he never had before, enjoying the pleasures of power and status in this world. But a sudden announcement that the nation has been destroyed shatters this wonderful life. Even though he has played through every route of the game and retains his character's base stats, he no longer has his old equipment, so victory is far from certain. This is a Cthulhu-style survival game. Evil gods, demon emperors, mutated extraterrestrials, and ancient behemoths invade one after another. Some evil gods have terrifying mechanics so unfair that even someone using cheats can be killed in an instant. Yue Lin must use his experience and wits to fight a desperate battle against one monstrous foe after another. The vast cosmos twists and cracks. Unknown energy surges and gathers, and a colossal red vortex, a deep abyss, appears among the stars. Terrifying, unidentified monsters lurk within the vortex, savage and ferocious. They devour the surrounding planets without mercy. This is the end of the entire universe, known as Calamity Week Eight! Later, Yue Lin finally learns why there is no eighth day of the week: because Week Eight is the end of the universe...