Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 533 - 534:

[ Milestone Reached: Unlocking Chaos Dragon ][ … Unlocking Dracula][ … Unlocking Zeus ][ … Unlocking Demon King of Shadows ]----It was a normal day on Earth. Suddenly, the sky turned dark, and massive tower-like structures descended from above. A loud, robotic voice announced the beginning of a chaotic apocalypse.With less than two minutes on the clock, everyone was given a chance to select from a list of mystery newbie packages designed to assist them in the impending apocalypse—each package containing classes, abilities, special boosts, and powerful relics.In the midst of the chaos, Dorian, an avid reader of 'Ethereal Descent', an unpopular apocalypse novel, was stunned to discover that everything was unfolding exactly according to the novel’s kick-off plot.THE NOVEL HAS MERGED WITH REALITY!WHO IS THE PROTAGONIST?Like the others, Dorian was presented with a list of special rewards to choose from.[ You have been chosen to partake in the VIP Newbie Package ][ Select one ]DING![ You have awakened special ability: CHARACTER BIND ][ You can bind with gods, devils, monsters, mythical creatures, favored sons of heaven, etc. ][ You've unlocked: Reader's Viewpoint ][ You've unlocked: Copycat ][ You've unlocked: Energy Parasite ][ You've unlocked Index Of Myth ]With his special ability, Dorian vows to dominate the novel’s world and its protagonist, while also unraveling the mysteries of the apocalypse.

I was once asked a question.“How far would you go for her?”“How much are you willing to suffer just for her ?”“Would you sacrifice yourself for her?”I answered“I will sacrifice myself, but at the same time I won't ”Why? He asked“It's simple ” I replied“I'm willing to die 9999 times just for her but on the 10 thousands time I won't die I'll live with her and make her happy ”“Why not a billion times”“It's simple it's because I love her and she loves me, I will live with her after 9999 deaths she needs me and I need her that's how much I love her”“Then die, die 9999 times just for her and save her from this world”“I intend to ”

Xia Zhijun got the title ‘study god’ after scoring first place in the whole city. He’s the model of a good student in a teacher’s eyes: good grades, good manners, and quiet. When he wasn’t smiling, his entire body emits a cold abstinence aura. The girls only have the guts to look from afar and not get close.
Later, it was rumored throughout the entire school that even the study god would fight and hit on girls. Whoever dared to provoke his girl, he would teach you how to be a person at every minute. The night of the graduation ceremony someone saw him blocking Gu Siyi in the corner. He didn’t stop kissing even when she cried. He bit her lips and said in a raspy voice, “I’m going crazy…”
During college finals, Gu Siyi almost bursted out crying, “I’m such a failure. I won’t be able to find a good job in the future…And if I can’t find a good job, I can’t provide for myself…”
Xia Zhijun played with her pink earlobe and remarked, “I’ll take care of you.”
After they graduated, Xia Zhijun created a research company and Gu Siyi became the boss’s wife.
The commercial rocket, “Star of Siyi” was successfully launched. So everyone knew that the new technology superstar, Xia Zhijun has a wife who he spoils a lot.

- Description from Novelupdates

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.