It was late at night and everyone fell asleep. Lin Feng suddenly opened his eyes, sat up from the bed, and whispered:

"Yinyu, are you summoning me?"

"Yes. Master, do you remember the upgrade opportunity I told you last time? Now it's time. Today is the full moon night, and it's the best time to upgrade the system to lv3 in one fell swoop." Yin Yu whispered.

"Are you finally going to upgrade..."

Lin Feng took a few breaths with some expectations, picked up the pocket watch and said firmly:

"Go to the rooftop!"

Lin Feng pried open the door of the rooftop, slowly walked to the rooftop and sat down, put the pocket watch in front of him. Yin Yu stood out from the pocket watch, flapped his wings a few times, fell steadily in front of Lin Feng, took a deep breath, and said to himself:

"On the full moon night, the world is full of restless energy, which is a good opportunity to upgrade to lv3 in one fell swoop..."

"What can I do to upgrade to lv3?" Lin Feng asked with a frown.

"I will become stronger." Yin Yu said firmly. After seeing Lin Feng's strange expression, Yin Yu quickly changed his mouth and smiled:

"Of course, you will be stronger, master, and redeeming things requires reputation. After upgrading, the mission will gain more reputation, and your original mind method will also increase with the power of the system upgrade, making your speed and strength higher. The most important point is that in order to thank master for your efforts to upgrade, the system will also reward you with a mysterious gift, so stay tuned."

"Last time it was a passionate kiss, what was it this time?" Lin Feng raised his eyebrows and said without objection.

"Haha, you really took it seriously. Last time I was just kidding you, kissing is just a way to connect with the host, as long as you can connect, it's enough." Yin Yu smiled.

"Huh...that's good..."

Lin Feng pressed his temple with headache, sighed lightly, and closed his eyes. Because Yin Yu was petite, he could only stand on tiptoe, hugged Lin Feng's neck with his arms, smiled slightly, closed his eyes, and gently pressed his lips...

"Swish swish swish swish..."

A silver light burst out from the two kisses. Gradually, Yinyu's body became more and more empty, and feathers fell off like snowflakes and fell on Lin Feng's head, strengthening Lin Feng's bones and body...

"We have already established an invisible contract, also known as synesthesia. Life and death between us are closely related. If I live, you will survive. If I die, you will die. If I am strong, you will be strong. If I am weak, you will be weak. If I am upgraded, your strength will also increase accordingly!"

In a trance, what Yin Yu once said appeared in Lin Feng's ear again. Lin Feng took a deep breath. The energy in his body made him want to roar to the sky, but considering his environment, Lin Feng still restrained the urge to shout and patiently felt the benefits of physical strengthening.

If the last upgrade brought more of a sense of strength, then the feeling this upgrade brought more of a sense of muscle solidification to Lin Feng. In the past, after the fierce battle, Lin Feng often felt a sense of weakness and weakness, which was the sequelae of gaining power by relying on the engine. Since Lin Feng began to try to temper this power using the incomplete North Ming Divine Art secret book, this feeling of exhaustion is gradually disappearing.

However, although Lin Feng relied on the Beiming Divine Art to regulate his breath, the side effects brought by the Beiming Divine Art put Lin Feng into deep danger. Last time on the Demon Island, Lin Feng absorbed Ni Peng's whole body skills. On the ring, Lin Feng absorbed some of Zhou Tianfeng's skills. With his original skills, there were already three forces in Lin Feng's body fighting each other. If it was not resolved in time, it would definitely be a disaster.

"Huh... no matter what, my strength has been greatly enhanced than before." Lin Feng let out a long sigh and said to himself.

"Well, so do I..."

The light on Yin Yu's body gradually converged and slowly fell back to the ground and smiled, and there was something like a staff in his hand at some point.

"What is this?" Lin Feng asked curiously.

"This is the fighter capability I upgraded this time. When I left the factory, I was equipped with a fighter capability: healing technique, as the most primitive fighter capability. After that, every time I upgraded, I would carry a fighter capability. The skill I carried last time was Angel Protection, and the skill I carried this time was electromagnetic shock. The electromagnetic shock can not only burn designated electronic equipment with the high-energy electromagnetic waves I emit, but also cause impact and stun effects on the enemy. In the future, I can better assist you in fighting." Yin Yu smiled.

"Well, that's the best. Today you also saw that the middle courtyard is creeping tigers and hidden dragons, and there are dangers everywhere. If I rely on my own strength, it will definitely not work. So, I need your help." Lin Feng shook his head helplessly and said.

"Master, do you have any plans?" Yin Yu asked with his head tilted.

"In short, fight for the necessary privileges first. Without privileges, there is no energy, and without enough energy, there is no fighting, let alone stand out here and become the last fifty people. This is a world where the stronger the stronger the weaker the weaker the weaker. I can't always grab someone else's dinner. For this reason, it is probably inevitable to fight a few fights." Lin Feng frowned.

"By the way, I have something to ask you after all. Yesterday I challenged those guys and successfully grabbed their dinner, which was considered to be a defeat. Why is my ranking card still 30 (?" Lin Feng pointed to the number on his chest and said unhappily.

"Well... because this is not a legal challenge, it can only be considered a simple robbery. I specially checked it. In the Intermediate Court, the legal challenge system is that two people are against two people, or multiple people are against many people. The conditions of both parties must be commensurate. Moreover, after defeating the other party, you must make a declaration of victory, such as the guy in the classroom yesterday said: 'Your ranking is mine!'. In this way, you can exchange rankings, which is considered a duel victory." Yin Yu explained.

"Oh, so that's it. Then go and find a bad guy to beat him up tomorrow and grab his ranking..." Lin Feng thought to himself.

"Don't be too confident. The Intermediate Court is not as easy as the Lower Court. The reason why you can win at night is that it is unexpected and take advantage of others' danger. They think your strength is only 30 (famous, so they did not use all their strength, but just deal with it at will, so they suffered a loss. And then you ran fast and ran away if you snatch it. If you wait for a few of them to come back to their senses and make an effective counterattack, you may not be their opponent." Yin Yu warned.

"So, you should take out the upgrade gift, right?" Lin Feng stretched out his hand and smiled as if he was an extermination merchant.

"well……"

Yin Yu shook his head helplessly and put a box in Lin Feng's hands:

"This is the reward given by the system to the host's hard upgrade this time. Please accept it."

"Let me see, what good thing is it?"

Lin Feng opened the box with anticipation and took out a secret book from it. The four big words written on the cover of the secret book made Lin Feng's pupils suddenly shrink several times:

"Nine...yin...true scriptures?"

The reason why Lin Feng was so shocked was because he knew the origin of this secret book. Nine Yin and Nine Yang, the ultimate principle of martial arts in the world. Lin Feng practiced the Nine Yang Divine Art, but his superficial skills could be used without any obstacles. It can be seen that the power of the Nine Yang Divine Art, and this Nine Yin True Sutra is not inferior to the power of the Nine Yang Divine Art. It should even be said that it is more practical and terrifying than the Nine Yang Divine Art!

"Don't be too excited. Master, you are a pure yang body and cannot practice these Nine Yin Scriptures." Yin Yu smiled.

"Then why are you greedy for me with this rude thing?" Lin Feng was immediately disappointed and rolled his eyes and said.

"You can't practice it, but there is a guy with a pure Yin body around you. If you two can practice the Nine Yang Divine Arts and the Nine Yin Jingshu, then you will be able to travel around the world and run rampant in the future!" Yin Yu said firmly.

"Pure Yin Body? Is it Ling..."
Chapter completed!