What is the main theme of the novel 'When I'm Gone'?

Tang Zhen transmigrated to an apocalyptic world, where humans struggled to survive in various buildings that they built because the ground was covered in lethal dangers that were invisible to the naked eye. Tang Zhen transmigrated along with his mutated cell phone that was packed with miraculous applications. There were all kinds of cities – some could fly in the sky, some could submerge into the ocean while some could become invisible – and shocking secrets were hidden within them. The power of Tang Zhen’s city was… He established a city and quickly leveled up his army with speeding tools. Then, he dominated this alternate world by seizing other cities. He sat at the very top. Beneath his feet was a vast floating city guarded by dragons and surrounded by angels. Countless cannons were also set up at various corners of the city. A million miles ahead, in the depths of the ocean, there was another city as large as a continent awaiting his conquest.

Outer yard disciple of the Tiansang Spirit Palace, Xu Xiaoshou, had average talent. However, after coming out of his death seclusion, he realized that everything had changed. He had received a Passive System with many strange, miraculous passive skills: He would become stronger with every breath. He would become stronger when he got attacked. He would become stronger when he got mocked… Xu Xiaoshou was forced to shout, “Oh God, I don’t want to be like this either. Everything I did was because I was being forced to! I am so passive!”

She conspires and provokes the most powerful young master in Beijing! They sign a contract and with his every call, she has to go anywhere and do anything his bidding. When their contract ends, she smirks and said, “I’ll take the money and you can leave. We don’t owe each other anything.” He is Young Master Ya who rules Beijing. He controls the business empire during the day, and he is the strongest king at night. He is cold and women are merely playthings to him. With his power, the women he has eyes on have never been willing to leave him, yet she is an exception. She loves money, like all the previous women, but she is never shy of showing her greed. And he never realizes that he will ever grow a heart for such a promiscuous and cheap woman… He points a gun straight at her heart. “Die with me, or accept my love—which one do you choose?” She pouts and turns around, before she pushes an adorable child into his arms. “Here, there’s your answer.”

She was born into an affluent family, but she was swapped at birth and got a different life. She grew up in a village. Just as she got the opportunity to transform her life, it got taken from her, and she was forced into a marriage to trade for a marriage for her mentally-challenged big brother. In the end, she died tragically. Gu Yan thought that if she could be reborn, she would make those who had bullied and insulted her regret everything! After being reborn with a superpower, her life became quite different. “With both the medical skill and the superpower, wastrels, shiver for me!” “Also you, handsome boy, I saved your life; shouldn’t you pledge to marry me?” Lu Ye smiled naughtily. “Of course. Just tell me, Yanyan, how many times do you want me to pledge per night?”

Be an Uber driver, one Pagani Zonda rewarded. Be a university lecturer, 10 buildings rewarded. Be a landlord, 1billion dollars rewarded. Be… Lin Yi was fired by his company and his girlfriend cheated on him. After all that had happened, he suddenly awakened the professional experience system. He could keep receiving awards as long as he kept trying and experiencing new professions? There is no job that Lin Yi isn’t familiar with! If there is, that means that the reward isn’t enticing enough!

"After Gu Xin recovered from her illness, she realized that her whole family had changed. His father who was a gambling addict that once almost sold his wife and daughter, also often picked fights after getting drunk. That same father now said that he would not gamble anymore. He wanted to pick up his textbooks and take part in the imperial examinations to give the three of them a happy life. Her mother who was not just efficient, but also detailed and thorough in her work, spent her days holed up in the house, not daring to try anything adventurous. She did not even dare to light a fire and was only fierce to her daughter. That same mother was now suddenly carrying a chopper and facing off debt collectors. Her embroidery was outstanding and she was cold to others, her sister, who never cooked, no longer held the needles. She smiled more and took over all the work in the kitchen. Gu Xin felt that she was dreaming. Apart from the changes in her parents and sister, after she saved a fish, those who scolded her would fall and those who had bad intentions toward her would be unlucky. If she wanted to eat something, living things would come to her door and knock their heads against her door. Even if they were not living things, she could still find them by coincidence. Everything was so wonderful! Of course, it would be great if the young master of the Zhou Family in town did not go crazy. The young master of the Zhou family said that her parents would sell her and her sister would harm her in the future. The young master wanted to take her far away and escape from the Devil's Den. Father Gu, "Where did this little brat come from? I'm nine thousand years old and only a thousand years away from ten thousand years old. Why would I sell my precious daughter?" Mother Gu, "Get lost, you rascal. I'm a strong woman who owns a big business empire. It's not easy for me to have a daughter. Can I bear to do that?" Sister Gu, "Scumbag male protagonist, don't think that I don't know how much of a scumbag you are in your book and how you will hurt my Xiao Xinxin. Pfft!" Young Master Zhou, "How is it different from my previous life? However, no matter how different it is, I won't miss my Xinxin in this life." Gu Xin, "Have you asked for my opinion?"