"But..." Xiao Yifei hesitated. After all, this could affect the person's cultivation for the rest of their life. Without Ren Tianye's consent, he couldn't make a decision forcibly.

"I know," Ci Xin said calmly. "This secret technique has significant aftereffects, but there's no other way, is there? Mr. Ren discussed this with me before, and this was the result..." Her voice was a bit strange, seemingly unwilling to resort to such a desperate measure.

"Alright, I'll go prepare," Xiao Yifei said, since Ren Tianye had already agreed to it, there was nothing more to say.

After dawn, Xiao Yifei asked the servants of the Mu Residence to notify Ren Tianye's brother, Ren Tianxing. After a few moments, Ren Tianye's twin brother arrived.

"No problem," after listening to Xiao Yifei's explanation, Ren Tianxing smiled and said, straightforward as a Northeast man. "I also hope my brother can get out of this suffering. Besides, our struggle against that organization has lasted more than a few years. Now that there's hope of breaking free, what's a little sacrifice?"

"Besides, for the rest of my life, cultivation is pretty much at a standstill," Ren Tianxing smiled. "If there's a chance to advance further, all the better."

Xiao Yifei smiled and said nothing. Indeed, for older individuals, this was a good method, as their advancement had mostly reached a plateau. By burning potential to enhance cultivation, it was a path of cultivation, and fortunately, older individuals didn't have much potential left.

Without further words, Xiao Yifei calmed his mind, adjusted his Qi, and pulled out his Green-eyed Silver-tailed Needle, placing it into several acupoints on Ren Tianxing's back. When the last needle entered, Ren Tianxing clearly felt his back acupoints suddenly open! But instead of Qi flowing out, external Qi flooded in wildly!

Like a spinning turbine, the airflow drove the operation of the cultivation technique, forcibly pushing his cultivation higher. This frenzied surge felt incredibly comfortable, entrancing, and inescapable!

"Guard your spirit and hold it tight," suddenly, Xiao Yifei's determined words rang in his ears. Ren Tianxing quickly stabilized his mind. Cold sweat dripped down his forehead, and he was alarmed. Close call! He almost lost his mind, immersed in the space of progress, nearly losing his wits and falling into deviation!

The surging power continued relentlessly. You must know, for cultivators, absorbing even a trace of external Qi in one cycle is quite commendable. Yet through this secret technique, external Qi autoscopically poured into the body. An endless stream flowed in, truly extraordinary!

The flowing Qi cycled step by step through his body, one cycle, two cycles... and even more. The excessive power brought about progression in cultivation, even higher levels. Ci Xin was in awe of this overwhelming power, which was simply irresistible for cultivators!

At the same time, she marveled at Xiao Yifei's potential. Such talent, mastering the Xiao Family's secrets, if he wished to create a multitude of talents, it would certainly be simple. He might even form an Ancient Martial Army without a hitch!

"It's done, the acupoints are opened," Xiao Yifei smiled and said, "the rest is up to Mr. Ren's own cultivation."

He was quite surprised too. It seemed the benefits from yesterday's Green-eyed Silver-tailed Needle were immense. Under normal circumstances, opening someone's acupoints could take a long time and much effort, but today, it seemed effortless, as if he had limitless energy in his dantian. He was curious about his current limits.

You must know, Ren Tianxing, already very powerful, after absorbing so much energy, naturally exuded an aura that made even someone as strong as Ci Xin feel uneasy. But for him, it was as if nothing happened, as if he controlled all of it effortlessly.

The two quietly exited, leaving the room to the adapting Ren Tianxing, hoping this method indeed helped Ren Tianye.

"The rest is up to Mr. Ren's fortune." Xiao Yifei smiled calmly, while Ci Xin said nothing, gazing at the sky.

A few hours later, as the two were still discussing combat plans, a "crack" sound resounded, the sound of a wooden door splitting. Both were startled, then Xiao Yifei knowingly smiled, "It seems Mr. Ren has succeeded, advancing to a new level."

"Hahaha..." Indeed, hearty laughter echoed from the courtyard. A powerful aura crushed the Wind Gang Qi, rushing above the two, making Ci Xin's face ache. But reaching Xiao Yifei, it vanished silently...

"This feeling! This powerful feeling!" Ren Tianxing burst out of the room, his body filled with immense power in every corner. He felt that with his current strength, he could punch a wild ox to death!

"Strange, strange..." Suddenly, looking at Xiao Yifei, Ren Tianxing asked with some confusion.

"Haha... what's so strange?" Xiao Yifei smiled indifferently, feigning ignorance.

"Previously, when I looked at young brother Xiao, my senses returned with a fog. How is it now, after my ascension, looking at young brother Xiao still returns a fog? Could it be young brother Xiao has already..." Ren Tianxing was shocked, then stunned! It seemed his own cultivation might not even reach half of Xiao Yifei's! This young brother, barely in his twenties, how formidable must his cultivation be, unbelievable!

Ci Xin listened, a rare show of expression on her face, surprised, she asked, "Xiao Yifei, now your strength is..."

Xiao Yifei smiled, scratched his head, a bit embarrassed, and said, "I don't know what level I've reached. But given the current situation, it's more than enough. I feel like my dantian contains endless energy, and I've restrained my aura as much as possible. I have a feeling that, in my current state, it would take several Mr. Ren's to match me in battle..."

"Tsk—" Ren Tianxing and Ci Xin gasped, then simultaneously said, "Monstrous!"

In truth, Xiao Yifei also felt lucky. He had only been cultivating for a few months. Previously, he focused on studying medicine and had just begun cultivation recently. However, fortunate encounters kept coming his way - Sun Flame Fire Refining Body, Qilin Blood, numerous cultivation secret techniques, his family's healing skills, and the beyond ordinary Green-eyed Silver-tailed Needle. Even an ordinary person could become formidable.

And at this moment, far in a mysterious secluded place, inside a filthy, stench-filled underground chamber, a group of men in black were torturing a slightly obese person. The person's skin was very pale, but now covered with a lot of black mud and clear red blood streaks, remnants of a whipping.

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