Under Lin's constant urging, Johnny nodded, quickly took out the notebook in his arms, turned to the latest page, pointed at the question on it and asked, "Professor, I don't quite understand the plane rectangular coordinate system you talked about today...especially this question..."

"If you want to determine the distance between two coordinate points, you have to use the Pythagorean theorem mentioned earlier. You can mark the difference between the horizontal and vertical coordinates on the coordinate axis, and then connect them with a line. This will turn them into two right triangles put together, so it's back to the problem of geometry..." Lynn explained to Johnny the idea of ​​solving the problem in a simple and easy-to-understand way.

The so-called doing business means giving special treatment! After all, Lin En had promised that as long as the student passed the exam, he would apply for graduation on behalf of the professor. In order to prevent too many people from passing the exam, the number of applicants was too large and was eventually rejected by the parliament, so the exam content was of course as difficult as possible.

However, there is a limit to the difficulty. It is impossible to come up with some knowledge points that have not been taught before. At most, the question types will be slightly more difficult... just a little bit!

In order to ensure that Johnny can answer all the questions correctly, private tutoring is essential.

Although it is a bit unfair to other students, it is not shameful to seek tutoring from a professor.

Lynn never forbad other apprentices from asking him questions, it was just that Johnny asked more and deeper questions.

Two hours passed in a flash. Johnny closed the notebook in his hand, looked up at Lin En, and said with a smile: "Thank you for your guidance, professor. I have to say that you are really a great teacher!"

The girl's cheeks were slightly flushed, and she looked at Lin En with sparkling eyes, as if she had been completely immersed in the academic exchange just now! "I just came into contact with Mathematical Olympiad earlier than you." Lin En shook his head.

At the latest, it was only half a year earlier. Johnny rolled his eyes at him, and he finally understood why the eyes of those students in ordinary classes were filled with envy, jealousy and hatred when they looked at them. This gap in talent was simply despairing.

"Then I won't bother you anymore, professor. See you tomorrow." Johnny put away the notes filled with answers and solutions and prepared to leave.

Lin En stood up and walked the witch to the door. Before leaving, the silver-gray-haired witch glanced at the knuckles of Lin En's left hand that opened the door, and said with a little emotion.

"I didn't expect the teacher would give you even this."

Lynn paused, then followed Johnny's gaze and looked down. On the ring finger of his left hand was the [Ring of the Faceless Man] from Radak.

Kelu is also a member of the Faceless Men...

Lin En was very surprised. This was totally beyond his expectations, but he remained calm. "Teacher, do you care about this ring? Do you know how to use it?"

Johnny shook her head. She only knew that Kelu had been wearing this ring since he accepted her as his apprentice. She guessed that it must be a very powerful alchemical tool, but it had never been used in front of her.

After the silver-gray-haired witch left, Lin En closed the door and looked at the [Ring of the Faceless Man] in his hand.

Could it be that Kelu had revealed his identity? But wasn't this guy captured by the Vatican and taken to the Holy City?

It would be good enough if you were not tortured or burned at the stake. The possibility of escape is very slim.

Or maybe before Kelu was arrested by the church, he had mentioned himself to someone.

Lin En suddenly thought of what one of the Faceless Men had said when he was at their gathering. Could it be that this number four was referring to his mentor Kelu? ...

The next evening, in the southern part of the Yieta Harbor, in front of a luxurious manor, a convoy of three vehicles pulled by camels slowly stopped in front of the door.

Lin En, who had already disguised himself, walked out of the car in the appearance of Ladakh. He was naturally here to attend the so-called promotion ceremony.

Along with Lin En came fifteen of Radak's apprentices. Bock, Patty and the others were expectant and excited, hoping that they would be chosen this time, and thus ascend to become a noble official wizard in one step!

"Lord Ladakh, please come in!" The burly guard at the door opened the tightly closed iron gate and invited respectfully.

Lynn and a group of apprentices walked through the gate of the manor and followed a cobblestone path towards the interior of the manor.

Behind him, the burly guard had closed the iron gate again and looked at everyone with a mocking expression, but he did not notice that a dozen small, black rats quietly slipped into the manor amidst the crowd.

These rodents are naturally puppets controlled by Lin En using the psychic magic [Undead Manipulation]. Their small size does not easily attract attention. In addition, there are a few gray crows and more secretive geckos.

Although they do not have much combat power, they can serve as his eyes to observe the layout of the entire manor and the surrounding environment. If necessary, the liquid bombs they carry may also come in handy.

After passing through a long corridor, Lin En and others arrived at the banquet hall of the manor. The interior was very spacious, and a variety of exquisite delicacies and desserts were placed on the long table.

At this moment, many guests have gathered in the banquet hall. A rough estimate is that there are probably one or two hundred people, most of whom are apprentices, but there are also many formal wizards. Barbara and Hank are among them. Lynn even saw Leia, the sheriff of Yieta Harbor.

They all had smiles on their faces and were talking to each other, creating a very harmonious atmosphere.

On the stage in the center of the banquet hall, a butler in a tuxedo was dancing an elegant jazz dance, and a pretty maid was holding a silver tray, ready to serve drinks and meals to the guests at any time.

"Radak, why are you always the last one to arrive?" Hank saw Lynn coming in, walked up to him and tapped him lightly on the shoulder.

"It's better to arrive at the right time than to arrive early, isn't it?" Lynn looked around the lively scene in the banquet hall and answered casually, then lowered his voice and asked, "Are you sure North will come to this gathering?"

In the past few days, Lin En also tried to control the gray crow to find North's trace, but to no avail.

"Since he hasn't canceled the promotion ceremony, he will definitely come!" Barbara said firmly.

As soon as Barbara finished speaking, North, dressed in a gray robe, appeared in front of everyone...

(End of this chapter)