Since the five side stories show the substantial harm of the forbidden love of gods and demons, why did Xuanyuan Houyi and Lin Shuangyun and Lin Jing'er fall in love for nearly a thousand years and be safe and sound, aren't they living well?

Yes, in the previous chapter, Xuanyuan Houyi's cultivation is the breath of ice and fire, and he is the only one in the seven major religions who can fuse the two high energies of ice and fire into one and burst out of a dark energy that is unique before.

(ps: dark energy is a more powerful energy, the details can be Baidu Encyclopedia)

So how did Xuanyuan Houyi cultivate a unique aura of ice and fire, and he could still be integrated?

Answer: Because only Hou Yi has Chang'e, the specific reasons are only described later, and there will be no spoilers for the time being.

Looking at the above metaphor of god and demon energy, Xuanyuan Houyi is not afraid to love demon women at all because of his unique cultivation method.

Therefore, the general law of the gods and demons was broken when Xuanyuan Houyi arrived, but why did Xuanyuan Houyi dare not openly marry Lin Shuangyun and Lin Jing'er?

In addition to the prohibitions followed by the so-called Shenzhou realm, according to another warning in the mythological world: If the combination of gods and demons does not die for a long time, once it comes out, its son will be a disaster.

The meaning of this warning is that if there are gods and demons who have been together for thousands of years and have nothing to do with each other, proving that they are harmless to each other, if such unreasonable energy is quietly combined and integrated, then their children will be a new species born with dark energy, and the arrival of the new species will inevitably endanger the survival law of the original species, and the reproduction of the new species will inevitably eliminate the existence of the original species.

So even if Xuanyuan Houyi and Lin Shuangyun sisters are not safe together, they don't dare to have a child, because they know that this child is probably a potential danger.

If this child goes astray before he becomes an adult, even Xuanyuan Houyi will be unable to curb the evolution of this lifeform that is born with dark energy.