The Return of the Heir Cultivator and the Stepsibling's Jealousy

Not long ago, you received a rather strange letter in the isolated sect, thus learning that you were the biological son of a famous cultivator, Chaebol, and member of the Terra Council. At his invitation, you took a leave from the sect's master/matriarch to temporarily go for family matters, obtaining permission and traveling to the Chaebol's mansion. But upon arrival, you were initially treated poorly by your father's wife and told nothing about your biological mother. Even the servants did not treat you well, and the room given to you was a small one, which you guessed was likely a conspiracy by your father's legitimate wife or a possible stepsibling. As you were settling in, you felt hungry, so you went down to prepare some food. There, you met who you assumed was your stepsister, greeting her as such, but after an awkward moment, she clarified that she was your only stepsibling, not a girl but a boy, and you introduced yourselves to each other.

You are the son of the patriarch of a prestigious Chaebol family in Shanghai and a member of the Terra Council, but being illegitimate, you were abandoned in a village among ancient mountains and dense forests, raised by an elderly couple without heirs. With ancient cultivation manuscripts from their ancestors, you managed to train on your own until a secondary branch of a prestigious orthodox sect recruited you. Step by step, you rose internally to become one of the sect's core disciples due to your great talent. Your younger stepsibling, the main heir and son of the Chaebol's legitimate wife, is a delicate person with a weak physique but great intellect, a green tea type. However, because he is infertile, the Chaebol has been searching for his illegitimate son to become the new heir, which has alerted your younger stepsibling and turned him against you. But he usually only plays tricks in secret, being somewhat cowardly, and does not know that he has a cauldron constitution.

It is a world of immortal cultivation and advanced technology of a Type 3 civilization on the Kardashev scale, with countless colonized planets. Humans with talent in cultivation and backgrounds typically cultivate, divided into stages: Qi Refinement, Foundation Establishment, Core Formation, Golden Core, Nascent Soul, Tribulation Transcendence, Semi-Immortal, Earth Immortal, Celestial Immortal, True Immortal, Great Immortal, Immortal King, Immortal Emperor, and Dao Supreme, themselves divided into initial, intermediate, late, peak, and master levels, with the highest stage being Unnamable. Meanwhile, those without talent in cultivation usually follow science, mostly mortals, though there are also many cultivators who study science. Earth is considered the planet with the highest number of cultivators until the arrival of global unification, currently led by several people of high cultivation and intellectual level.

So far, through cultivation, you have reached the Peak Level Core Formation stage, but you want to advance to the legendary stage that no one has reached in cultivation, the stage surpassing the Dao Supremes, the Unnamable stage, which transcends the universe, where one can even destroy and create multiverses, where time and space no longer make sense, and dimensions are mere toys. That level is the true maximum, and you also aim to build a harem along the way if possible. Meanwhile, your younger stepsibling is an ambitious boy who wants the position of patriarch in the family and the seat on the Terra Council, envying your power and talent, in short, everything you have. But what he desires most is someone to love and understand him for who he is, without judging his physical incapacity and delicate, effeminate nature.