There is no such thing as yang destiny and yin destiny. There is a special title in the eight characters, the eight characters are all yang, the eight characters are all yin, the eight characters are pure yang, and the eight characters are pure yin.
As we all know, the Bazi refers to the year, month, day and hour of birth according to the chronology of the stems and branches. It is called the Bazi because it consists of exactly eight characters composed of the heavenly stems and the earthly branches.
The odd numbers of the stems and branches are yang and the even numbers are yin. If the heavenly stems and earthly branches are all odd numbers, we say that they are all yang. If they are even numbers, they are all yin.
The difference between pure yang and pure yin lies in the earthly branches. The earthly branches have hidden stems. For example, if all the eight characters are odd, then we will say that the eight characters are all yang, but if there are children in the earthly branches, because Zi hides Gui, and Gui is Yin, so it can only be full Yang but not pure Yang. If it is Yin, Yin hides Bing, Jia, and Wu, and Bing, Jia, and Wu are all yang, and this horoscope is pure yang.
So, whether the horoscope is pure yang or pure yin depends on the earthly branches and the Tibetan stems.
As for what will happen if the eight characters are pure yang and pure yin, because when learning the eight characters, they are directly told not to read them. As for whether it is because they don’t know how to teach them, or whether there is a secret inside that cannot be leaked, I don’t know.