Both time-traveled characters ended up as villainous henchmen.

Taiji is the origin of the universe, the chaotic state before the separation of heaven and earth, without beginning or end and omnipresent.

The two polarities are Yin and Yang. Taiji moves and generates Yang, and when movement reaches its extreme, it becomes still, and when stillness generates Yin, and when stillness reaches its extreme, it moves again. Movement and stillness are mutually rooted, and from this, Yin and Yang are divided, and the two polarities are established.

After Yin and Yang, they continue to differentiate, forming Lesser Yang, Greater Yang, Lesser Yin, and Greater Yin, which are the Four Symbols.

The Four Symbols Seal in the Naruto world refers to the Azure Dragon, Vermilion Bird, Black Tortoise, and White Tiger, which seems to be different from Lesser Yang, Greater Yang, Lesser Yin, and Greater Yin.

Actually it is not.

The Azure Dragon, Vermilion Bird, Black Tortoise, and White Tiger can represent the five elements: wood, fire, water, and metal.

In the Yin-Yang and Five Elements theory, water belongs to Taiyin, fire belongs to Taiyang, wood belongs to Shaoyang, and metal belongs to Shaoyin. Thus, the two seemingly different Four Symbols are actually connected internally.

Earth is formed by the interaction of Yin and Yang energies, and it runs through the entire cycle. The four elements also need the support of Earth to circulate.

The final Bagua (Eight Trigrams) is a further differentiation of Yin and Yang based on the Four Symbols. It involves adding or subtracting Yin and Yang elements on the basis of the original Lesser Yang, Greater Yang, Lesser Yin, and Greater Yin, thus evolving into the Bagua.

This evolutionary pattern is vastly different from the evolution from the Four Symbols Seal to the Eight Trigrams Seal in the Naruto world.

One is a further differentiation of Yin and Yang, and the other is simply the superposition and nesting of two seals.

As for which option Izumi Nen would choose, the former is naturally supported by theory, since he simply cannot handle the latter in a short time, and even if he could, the Bagua Seal would probably not be able to adapt to the situation inside his body.

What he needs is a completely new Bagua seal that can perfectly adapt to his physical condition.

It just so happens that he is currently in the initial fusion stage of Yin-Yang Escape, so perhaps he can take this opportunity to try to create a simplified version of the Yin-Yang Seal.

The interaction of Yin and Yang forms Taiji, which then divides into Yin and Yang. These Yin and Yang further differentiate, evolving into the Four Symbols. The Four Symbols form the framework for constructing a cycle...

Upon realizing this, Izumi Nen's thoughts flowed like a spring, and he immediately took out a brand new sheet of white paper and began to quickly deduce and write on it.

He already has the theoretical foundation, but he still has a lot of research and experiments to do in order to combine it with the specific chakra attributes and form changes in the Naruto world.

However, the initial direction of Yin-Yang fusion was already chosen by Izumi Nen's immortal body.

Two days ago, after the initial evolution of the Purple Nether Eye's pupil technique bloodline, the fusion progress of Yin-Yang Escape within his body, which had been temporarily halted due to the imbalance of Yin and Yang, has resumed.

Furthermore, thanks to the power of evolution from the Digital World, the fusion process of Yin-Yang Release was greatly accelerated.

The direction in which Yin-Yang Escape first began to merge was the Yuan Shui Water Escape and the Ming Shui Yin Escape within his body.

Based on this, Izumi Nen already had a general idea of ​​the sealing technique design in mind.

Meanwhile, his immortal body evolution was completed first.

However, since the Sage Body has not yet been combined with the chakra system within his body through sealing techniques, the characteristics currently exhibited by the Sage Body are merely another improvement in the basic numerical stats.

However, even with a general idea in mind, designing the Two Elements Sealing Technique still took Izumi a considerable amount of time.

After all, the Yin-Yang Seal is not like his Purple Nether Eye Yin Escape Seal Technique; its scope is much wider and more complex.

Furthermore, since this was to be used on himself and was an important foundation for the future system, Izumi Nen dared not be careless at all. Not to mention deleting and modifying, he even started from scratch more than ten times.

Therefore, in the time that followed, aside from ensuring his basic training, Izumi Nen devoted all his energy to the research of the Yin-Yang Seal.

Time flew by amidst their busy research life, and the Chunin Exams were just around the corner.

Fortunately, just before the Chunin Exams began, Izumi Nen finally completed the perfect design of the Ryougi Seal.

Before he could even use the sealing technique to further fuse Yin-Yang Release and the Sage Body, Izumi Nen left the laboratory and headed to the Chunin Exams.

……

Chunin Exam venue.

The first test was the familiar theoretical exam, which also served to assess the intelligence-gathering abilities of the genin.

Izumi Nian sat in the examination room, looking at the simple questions on the test paper, and began to drift off into a daze.

After a quick glance around the exam room, he soon spotted a masked, gloomy white-haired man—Kakashi Hatake.

Because Orochimaru had mentioned this to him beforehand, Izumi Nen wasn't very surprised by Kakashi's appearance.

Perhaps, he'll even get to fight Kakashi in the end.

At this stage, Kakashi is basically still a sunny young man, but soon, Kakashi's father, White Fang, will commit suicide due to mission failure and public pressure.

"Alas, the darkness of Konoha."

After silently sighing to himself, Izumi Nen slowly began to answer the question.

The difficulty of the questions was not a problem for him at all. Even in terms of intelligence gathering, his Purple Nether Eye could achieve a certain effect, although it was not as convenient as the Sharingan to directly copy actions.

Thinking about this, it seems there are several Uchiha clan members in this Chunin Exams, and some of them have awakened their Sharingan bloodline limit.

Soon, a dark purple hue appeared in Izumi Nen's eyes, and he focused his attention on the ninjas whose clothes were embroidered with fan patterns.

However, as soon as Izumi Nen's gaze met those of the awakened Uchiha clan members, they quickly responded with a pair of scarlet eyes.

Sigh, the Uchiha clan has such a bad temper. Looking at it this way, Obito is indeed a rare breed.

Izumi Nian didn't hold a grudge against the other party. Anyway, there would be plenty of opportunities to observe closely later on in the wilderness survival test.

Not long after, the first written test ended, and Izumi Nen passed it without any suspense.

In the second wilderness survival test, he has another important goal: to complete the construction of his own Yin-Yang Seal and establish the initial cycle of the Sage Body and Chakra system.

Fortunately, he participated alone, so there was no trouble with team members.

In a good mood, Izumi Nen hummed a song as he walked toward the examination hall for the second test. He even greeted Kakashi as he passed by.

As expected, Kakashi still had a deadpan expression.

Meanwhile, besides Orochimaru, Izumi Nen's teacher, the Third Hokage, Hiruzen Sarutobi, was also closely watching Izumi Nen's Chunin Exams.

This caused trouble for another person who was secretly observing Izumi Nen.

Danzo Shimura was somewhat exasperated. His Root intelligence department had received a top-secret message.

Izumi Nen seems to have made an extremely important discovery, which has attracted the attention of Hiruzen Sarutobi.

This made Danzo restless. He originally wanted to use their shared interests to bind the young genius Izumi Nen to the Root organization, but the kid only contacted him once and then ignored him.

Now, he's even quietly put a big show on Hiruzen Sarutobi, which makes Danzo Shimura extremely envious.

Fortunately, Root had made corresponding preparations for Izumi Nen's Chunin Exams.