As the two of them each started their own cultivation techniques, the Heaven and Earth Yuan Qi between the surrounding heaven and earth began to slowly move towards the room.

Double cultivation is indeed a special cultivation method that can multiply each other's cultivation speed, and the two of them can clearly feel that the speed at which the Heaven and Earth Yuan Qi between the surrounding heaven and earth is close to each other is much faster than when they were cultivating separately before, and the concentration is also much higher than when they practiced alone before.

Of course, if you want to double study, you must meet one of the most important prerequisites, that both men and women complement each other's physiques.

After the surrounding heaven and earth Yuan Qi continued to move closer, Ye Feng and Zhang Kexin began to draw Qi into their bodies, transforming them into the Yuan Force needed in their bodies and storing them in the middle dantian in their respective bodies.

This kind of Yuan Force that has just been induced into the body and transformed into the middle dantian stored in the body, just after it is stored, it automatically guides the Yuan force that was originally stored in the middle dantian to flow out slowly, and finally pours into the other party's palm through each palm, and then slowly pours into the other party's body and flows.

"It's so cold...... As the Yuan Force in Zhang Kexin's body entered his body, Ye Feng felt a cold feeling.

Zhang Kexin's girl is a lot better, but there is a slight warmth, and there is no feeling of being too much.

This girl's physique is a rare Nine Yin Absolute Body, and it is the rarest Nine Yin Nine Absolute Body, this kind of inherently pure negative physique, coupled with the 'Nine Yin Jue' This kind of cultivation method of the world's most yin, the cultivated Yuan Force is the world's most yin and pure Yuan Force, this girl's Yuan Li is born with a piercing and cold aura.

Although Ye Feng's physique is a rare yin and yang body, the mental method of the 'Yellow Emperor's Inner Scripture' that he cultivates is the most masculine and rigid mental method in the world, plus the reason why men are naturally masculine, so his Yuan Li naturally carries that kind of masculine temperature.

One is the world's most yin and pure yuan force, and the other is the world's most yang and strong yuan force, this polarized yuan force, after pouring into each other's bodies, the feeling is naturally more obvious.

Of course, in fact, the most important reason is the gap between the realms of the two people, after all, Ye Feng is only the strength of the early stage of the Yellow Order, and Zhang Kexin has already reached the strength of the peak of the Yellow Order, so there is a big difference between the mellowness and strength of the two people's Yuan Force.

This is also the fundamental reason why Ye Feng felt a cold feeling, while Zhang Kexin was just a slightly warm feeling.

Each other's Yuan Force returned to the middle dantian in their respective bodies after running in each other's bodies for a week, and both of them clearly felt that the Yuan Force that entered the body at this time was indeed much more refined, if the same Yuan Force was released, now this kind of Yuan Force that was stored in the body after a week of operation in the other party's body was definitely much stronger than before, and could even reach several times.

"It's so fast...... As this kind of Yuan Force runs in each other's bodies, they return to their respective bodies every day, and the two of them feel that the speed at which the Heaven and Earth Yuan Qi gathers is getting faster and faster, and the speed of inducing Qi into the body has also accelerated a lot.

Along with it, the speed at which Yuan Li flowed out also accelerated a lot.

Slowly, the cold feeling on Ye Feng's body became stronger and stronger, and Zhang Kexin was still not unusual.

At this time, if the two of them opened their eyes to see, they would definitely open their mouths wide in shock, the golden light and the silver-gray light on Zhang Kexin's body were intertwined with each other, showing a state of yin and yang harmony, and on Ye Feng's body, the golden light almost disappeared, almost completely covered by the silver-gray cold busyness.

Moreover, there was a white sight on the hair, eyebrows, and eyelashes, and there was a feeling that frost was about to form.

As time passed, the light of yin and yang harmony on Zhang Kexin's body seemed to be more and more harmonious, but Ye Feng's situation seemed to be getting worse and worse, the golden light disappeared completely, and the whole person was covered by a layer of silver-gray cold air, and the whole body had begun to condense frost.

Nearly an hour passed after "It's almost ......", Zhang Kexin finally felt the loosening of the fourth realm, and the moment he was happy, he felt the strangeness of his body.

The girl hurriedly held her breath and kept her mind steady, and then slowly returned to normal.

Finally, after the past hour and a half, Zhang Kexin's fourth-level barrier for cultivating the 'Nine Yin Technique' was finally broken, and with the huge amount of yuan power being stored, he finally reached the fourth-level realm.

At this moment, this girl felt that her whole body was instantly filled with abundant yuan power, full of power.

Ye Feng also felt the strong loosening of the barrier of the second center of gravity method of the 'Yellow Emperor's Neijing', and that feeling was like only a thin layer of window paper, which could be pierced with his hand.

Just as he was trying to pierce this layer of window paper, with the breakthrough of Zhang Kexin's realm, that cold chill instantly deepened a lot again, Ye Feng felt as if his whole body had been pierced by the cold and biting cold, and the whole person was a little trembling.

Working hard to run the 'Emperor's Inner Scripture' mental method to counter this cold, Ye Feng felt that he was about to pass out several times, but with strong perseverance, he finally gritted his teeth and stopped.

Boom......

Finally, just when Ye Feng was almost unable to resist that cold chill, Ye Feng felt a loud sound like an explosion in his body, and the barrier of the second layer of the 'Yellow Emperor's Inner Scripture' was finally broken, and in an instant, his body seemed to be a lot warmer, but it was still completely against that cold chill.

Continuing to cultivate, as time passed, the warmth that had just been cultivated in Ye Feng's body slowly disappeared again, until the icy chill pierced his whole body again.

However, just when Ye Feng felt that he was about to be unbearable again, that cold chill disappeared in an instant, and Zhang Kexin's voice rang out: "Okay, Master said that double cultivation just now can't exceed two hours at most, and now it's almost the time to reach the limit." ”

Ye Feng slowly breathed a sigh of relief when he heard this, fortunately there was a time limit, otherwise if he continued to cultivate like this, he really didn't dare to guarantee whether he could continue to hold on.

"What's wrong with you?" Opening his eyes and looking at Ye Feng's appearance covered by a layer of frost all over his body, Zhang Kexin said in shock.

"What's wrong?" Ye Feng opened his eyes and looked at it, and was immediately shocked by the appearance on his body.

No wonder I felt such a biting chill just now, and after a long time, my body was frosty.

"When you were cultivating just now, did you feel anything uncomfortable?" Zhang Kexin continued worriedly.

Although the dual cultivation of male and female physiques can increase the speed of cultivation to the greatest extent, it is also very dangerous, and the slightest negligence can easily lead to irreparable consequences.

"Uncomfortable? At the beginning, it was better, but it felt a little cold later, especially in the last moment, and the biting cold was even stronger. Ye Feng thought for a while.

"It's all my fault!" Zhang Kexin, the girl, seemed to suddenly remember something when she heard this, and said with a frightened face: "Master once said that if there is a gap between the realms of two people during double cultivation, which one with the higher realm must control the output of Yuan Li to remain in the same realm of the other party, otherwise, it is easy to cause harm to the other party." ”

"Kexin, you are going to murder your husband, but fortunately, I have broken through to the second realm." Ye Feng said with a wicked smile on his face.

"I'm sorry, it's all my ......" Zhang Kexin's face was dull and he said very self-reproachfully.

looked aggrieved, and his eyes almost flashed with crystal tears.

If the double cultivation is not done properly, it may lead to serious consequences, and when she came back, the master had already emphasized it to her repeatedly, but she had forgotten such an important matter.

Fortunately, it didn't cause any consequences, otherwise, she would not be able to forgive herself for the rest of her life.

"Okay, just kidding, besides, don't you think I'm doing well now." Ye Feng smiled and comforted: "Moreover, if it weren't for your pressure, I might not be able to break through to the second realm of the 'Yellow Emperor's Internal Scripture' today." ”

"You've been a blessing in disguise this time, but it's not necessarily so good luck next time." Zhang Kexin continued, still looking apprehensive when she spoke.

She secretly made up her mind in her heart that when she cultivated in the future, she must control the output of Yuan Li, and there would never be a situation like today.

"Haha, you are the peak of the Yellow Order, I am now in the middle of the Yellow Order, we are only one realm away, I can catch up with you with my hard work." Ye Feng got up and said with a smile.

"The second realm, the middle stage of the Yellow Order, is good." The girl continued with a smile. "But the peak of the Yellow Order, who is the peak of the Yellow Order?"

"You......" Ye Feng replied without hesitation, and only after speaking did he realize the problem from the expression on Zhang Kexin's face: "You won't also break through, right?" ”

"Well, I have reached the realm of the fourth heaven, and according to the division of the realm, I am now in the early stage of the mystery." Zhang Kexin said with a smile.

The Nine Yin Jue and the Yellow Emperor's Neijing are the same as this top-level saint-level exercises, the triple is a realm, corresponding to the realm of the ancient martial artists, one corresponds to the early stage of the Yellow Order, and the second corresponds to the middle of the Yellow Order.

The threefold corresponds to the peak of the Yellow Rank and the peak of the Yellow Rank Great Perfection, but the only difference is the accumulation of Yuan Force in the body.