Definitely 'Watchmen' by Alan Moore. It's a deconstruction of the superhero concept. The complex characters, intricate plot, and moral ambiguity make it a masterpiece. It's not your typical superhero story but rather a deep exploration of power, morality, and the human condition in a world with 'superheroes'.
One of the best is 'The Dark Knight Returns' by Frank Miller. It reimagined Batman in a darker, more gritty way, and had a huge impact on the character's future portrayals. It showed an older Batman coming out of retirement to clean up Gotham again, with great art and a compelling story.
The 'Civil War' storyline in the Marvel Universe is also great. It divided the superhero community over the Superhuman Registration Act. This led to intense battles and moral dilemmas as heroes had to choose sides, whether to support registration and government control or oppose it for freedom.
Chapter 683, "This is where you will be filming from now on!", is the clearest early answer because it turns Sister's situation into a concrete plot event. The chapter turns that into something concrete by moving from The Capital had entered winter by November.
Chapter 434, "The Identity of the Feng Shui Master Can't Be Hidden Anymore", is the clearest early answer because the hidden truth stops feeling like mere subtext. The chapter turns that into something concrete by moving from He thought Jiang Li was just talking, but to his surprise, there...
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jin's situation into a concrete plot event. Early on, Jin Si Yue suddenly realized that his wrist was back in proper....
Chapter 447, "Going Viral on the Internet", is the clearest early answer because it turns Zheng Xun's situation into a concrete plot event. It opens with Old Sir Jiang: "...." His face had grown even worse. and closes on She quickly grabbed He Wen's laptop and indeed saw that the various....
Chapter 469, "He Must Not Tolerate This Calamity", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, There was no other choice, so Jiang Li and the others hastily turned....
Chapter 516, "Choosing You as an Undercover Agent is Pretty Stupid", is the clearest early answer because it turns Team's situation into a concrete plot event. The chapter gives readers a real answer by opening on Why are you skulking around and observing us?" Jiang Li cut straight...
Chapter 498, "How can someone be so ugly?!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from .....If you don't love me, give my heart back, you traded love for my...
Chapter 367, "Help Me Call the Police", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with However, before they could approach, another loud "bang" sounded as...
Chapter 344, "Actually has one million fans?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Just as he was about to slip into sweet slumber and catch up on some...
Chapter 527, "Shaojing Bro, I'm Sorry", is the clearest early answer because it turns Zhuola's situation into a concrete plot event. Early on, Jiang Li, taking advantage of these people's inattention, had already....