Obsession with nothingness = the truth of your destiny, the secret of your soul, the suffering in the world, the bonds of love and hate, all the obsessions that you have been desperately pursuing for half your life. In the end, you see that they are all false and catastrophic.
Return to my first spirit = The final finale is closed, washing away all the memories of reincarnation, mortal scars, and Chen Yilin in the human world, and returning to the original, cleanest, and flawless first spirit of Hongmeng.
Philosophy: The disasters in the world are all illusions of the inner demon. After hundreds of reincarnations, the heroine lets go of her obsessions, finds her true self, and understands that true love and freedom are far more important than the rules of heaven.