What about the boy born at eight o'clock in the morning on the 21st of the twelfth lunar month? What's his birthday? Which of the five elements is missing? Thank you for your answers!

Eight characters: Xin Mao, Xin Chou, Jia Xu, Chen Wu.

The core monument of life is A, and the five elements belong to wood, which was born in the ugly moon of frozen soil in winter. Wood is hard to live and life is not strong. The other three are heavenly stems and earthly branches, who are extremely weak. The king of the earth gives birth to the golden rule, and I am a wood, but the wood is weak. When I was a great supplement to Shui Mu, I searched for the five elements of Chinese characters and chose my favorite characters belonging to water and wood.