The Reincarnated Cub of Light Is Considered Weak by the Reborn Empress?

Lin Bei was reborn in the Kingdom of Light and became the newly born Ultraman Zero. I thought I was getting Sai Shao's cool script, but I didn't expect that less than five minutes after he was born, he was transported to a world of beast control, and became the contracted beast awakened by the reborn empress Bai Chuxue. Bai Chuxue disliked him for being too weak and abandoned him directly. According to the rules of the beast-controlling world, abandoned contracted beasts will be dissolved by the power of law. The aloof school belle Gu Qinghan couldn't bear it, so he exchanged his awakened mythical beast with Bai Chuxue and made a contract with Lin Bei. Unexpectedly, the moment the two completed the contract, they actually completed the assimilation of one mind. Gu Qinghan, the beast master, directly became Lin Bei's human body. Lin Bei was also influenced by Gu Qinghan and transformed from a cub of light into the adult form of Ultraman Zero. When darkness falls. Lin Bei and Gu Qinghan transformed together. The giant of light stands on the earth, crushing the darkness with light! ........... Empress Bai Chuxue: In my previous life, I was a destined person. I practiced hard for twenty years and became the youngest and most powerful empress in the history of the human race. Only half a step away, you can step into a realm that has never been achieved before. It's a pity that God didn't give me a chance. When I was about to break through my cultivation level, it sent down darkness and chaos to destroy the world. In my new life, this time, I will definitely surpass my previous life, stand on the top of the world, and destroy the darkness and chaos with my hands! Become the only legend in the world! But... Why did the cub contract beast that I despised become able to merge with Gu Qinghan and become a giant of light? Also, what is Ultimate Glory Zero? What is Saka?