Turning misfortunes into good fortune starts with seizing the direct descendants in Kowloon

Lu Mingyuan traveled through time and became the sixth prince of the Great Yan Dynasty. Because he was bewitched by his beauty, he let go of the enchantress from the Demon Kingdom. He committed a serious crime and was banned for thirty years. He declared that he had no chance to be the emperor. The beginning was a copy of the Hell of Kowloon Seizing the Directive.
However, he unexpectedly got a mysterious six-line turtle shell, which allowed him to see various hexagrams, turn misfortune into good fortune, and receive various fate blessings.
[The auspicious hexagram of the upper line, guarding the palace is a blessing, the princes will not regard you as a thorn in their side, and the disaster is that your reputation will not be due to the throne. After being banned, you can get the emperor's orange fate (trapped dragon in the abyss)]
[Under the auspicious hexagram of Yao, exile in the Western Wilderness will be a disaster, and the subsequent war will be fierce. Good fortune will be far away from the court, the earth is far away, and the sky is high. If you successfully escape, you will get a blue destiny (the exiled emperor)]
....
Ever since, life has entered a simple mode, and Lu Mingyuan began to accumulate fortune, lying drunk in the harem, watching the rising and falling clouds in the capital, observing the situation as strange, dangerous and troublesome.

I thought he would live like this forever, but I didn't expect that when the demon girl returned to her country and ascended the throne as emperor, the first thing she did was to attack Dayan to rescue him.