Douluo Continent: Starting from Awakening the Vermilion Bird Martial Soul

After Lin Bai transmigrated to the Douluo Continent, he would always find some strange things on his birthday every year.
At the age of one, Cupid's artifact descended from the sky, opening up a spiritual sea for Lin Bai and awakening his innate wisdom.
At the age of two, he pulled out a book that was used to prop up the corner of the table at home. He opened the book and found many little figures hugging each other. After reading the book, Lin Bai felt a surge of energy within him.
At the age of three, he found an ordinary wooden ring. Inside was an old man with a white beard who claimed to be a medical sage. He taught Lin Bai a set of acupuncture techniques, established three rules for him that he would not treat, laughed three times, and then ascended to heaven.
Four years old, five years old... Lin Bai would gain something every birthday.
During this process, many changes occurred in the Douluo Continent.
Why did Tang San and his son never meet in their lifetime? Was it revenge, or did they want their son?
Why does the Sea God frequently descend to the mortal realm, and how will the Spirit Hall solidify its position?