This investigation actually allowed Zhang Yuan to find the specific reason.

If Guo Nanyue had continued to practice his martial arts that could rejuvenate him at any time, his body would never have been in his current state of yang deficiency and yin excess.

The main reason for this condition was that she suffered serious internal injuries when she was 26 years old, which directly caused damage to her Dantian.

The extent of the damage was quite subtle, causing her Dantian to only be able to gather Yin energy but not Yang energy.

Over time.

Her body lacked the normal circulation of yin and yang, so even though she could still practice this technique normally, it always caused her to lack yang energy.

In normal circumstances, her face was very pale and she looked malnourished.

If this situation continues for another few decades, even though Guo Nanyue's strength will grow steadily, her body will suffer unimaginable consequences due to the long-term lack of yang energy.

And Guo Nanyue herself definitely knows about this situation.

In all likelihood, she has been trying to find a way to make amends, otherwise, after I replenished Guo Nanyue's yang energy last time, she would not have been so excited, nor would she have wanted to directly recognize me as her godfather and follow me around at all times.

A big reason is...she wants him to replenish her yang energy anytime and anywhere.

In this way, her cultivation can proceed steadily and her health can gradually improve.

Perhaps, this is also a great use of my value to Guo Nanyue.

After figuring out the reasons for this series of events, Zhang Yuan slowly moved his fingers away from Guo Nanyue's brows.

Then he sighed deeply and said:

“Nanyue, why don’t you change your identity and talk to daddy… Dad thinks it’s hard for you to pretend.

You clearly suffered serious internal injuries when you were 26 years old. You are now at least 30 years old, and may even be over 40 years old...

However, you insist on pretending to be a cute 13-year-old kid. I think it is really hard for you to pretend.

Why don't you just be honest and call me daddy frankly...how about that???

This way, you will feel better and more at ease, and maybe the yin and yang will be able to be properly balanced...”

As soon as Zhang Yuan said this, Guo Nanyue was struck by lightning. She was so shocked that she stood up immediately and stared at Zhang Yuan with complicated eyes.

Doubt, shock, coldness, murderous intent...

All kinds of emotions came together in her.

After a long time.

Guo Nanyue said coldly:

"I never thought that you could see through me even though I tried so hard to conceal myself.

Doctor Zhang, Doctor Zhang, you are truly a capable person..."

Zhang Yuan smiled and said:

"Thank you for praising me, dear daughter.

Since you've admitted it, why don't we be honest with each other first? Tell me who you are and what is your purpose in playing the role of Guo Nanyue?

Where did the real Guo Nanyue go?

Let’s talk about what we need to talk about. I can cure all the diseases you have.

Yes, I can accurately judge that you suffered an extremely serious internal injury when you were 26 years old.

That internal injury changed the fate of your life.

For you, it can be said to be unforgettable. Although I don’t know what you went through at that time, there is one thing I can be sure of.

That incident made you completely desperate and almost lost the courage to live.

But later, you survived with your own perseverance, and repaired your Dantian. However, the repaired Dantian could no longer restore your yang energy.

Even if the technique you practice is very powerful and impressive.

Unfortunately, there is no way back. You want to regain your youth and the innocence of a girl, so you start practicing to gradually replenish your Dantian.

You imagined everything to be beautiful at the beginning, and you felt that everything could be done again.

In fact, it is so difficult that you can't do it.

As a result, you have now suppressed your age to 13 years old, but you still cannot make up for the damage to your Dantian.

The young body functions are unable to restore the Dantian.

So, at this moment, you are actually living a very anxious life every day, and your mentality is extremely unstable, am I right?"

Every word Zhang Yuan said touched Guo Nanyue's heart.

This made Guo Nanyue, who was about to explode and attack Zhang Yuan, sit down again, and the solemn and complicated expression on her face gradually calmed down.

Until she returned to her original appearance as Guo Nanyue.

And she smiled, with a cute and sweet smile on her face. She just looked at Zhang Yuan quietly without saying anything, which made Zhang Yuan a little confused.

After the two looked at each other for a full five minutes, Guo Nanyue said:

"Dad, you are such a good dad to me!!

No one has ever seen me so clearly like you do. Perhaps this is fate. Since you can see through everything, it is not impossible for me to confess everything to you. But I want to ask you a question. Please answer it truthfully. "

Zhang Yuan said without even thinking:

"Okay, since everyone has spoken frankly, even so, you still called me dad, which means you actually admire and respect me a lot.

In this case, I will also call you my good daughter, because I also think you are quite interesting and frank. Just tell me directly, what do you want to ask? "

Guo Nanyue said:

"I just have one question. Can you save me from this dire situation? Can you make my Dantian normal again? Can you fix me?"

Zhang Yuan said categorically:

"able!!!!!

Must be able to!!!

100% sure!!!

It's just a minor injury to the Dantian, what's the problem?

If I keep replenishing your yang energy, it will only be a drop in the bucket and will only treat the symptoms and not the root cause.

So if you want your body to completely return to normal, repairing your Dantian is the truly useful treatment.

And I... can actually do it.

I don't care what kind of doctors you have had before or what kind of treatment you have received.

But I can tell you very clearly that as long as you listen to me and follow my method of treatment.

Within half a year, I guarantee that your Dantian will be as good as new, and I guarantee that you will never be short of Yang Qi again."

Zhang Yuan's words were powerful and his face was full of ambition and composure.

Guo Nanyue was really happy this time, her eyes were shining.

Because she dreamed of repairing the damaged Dantian into a brand new one, so that she could continue to practice her powerful skills.

At the same time, once she has truly recovered to her peak combat power, she will no longer have to live in Qingcheng City.

She could now officially go for revenge, kill all those who had ever hurt her, and let them all go to hell.

Think of this beautiful future.

Guo Nanyue's eyes became more and more excited, and finally she looked straight at Zhang Yuan and said:

"Dad, you have to help me. As long as you help me, you...you are my dad. No matter if you are younger than me or what, I call you dad and you have to be my dad for the rest of your life!!!"

Zhang Yuan said with a smile:

"My dear daughter, you are really an interesting person, okay.

It's not a big deal. Since I can help you repair your Dantian and give you such a big favor, shouldn't you show your filial piety to me? "

Guo Nanyue frowned and said:

"I knew you had something to ask me...

Although I thought about it over and over along the way, I still couldn't figure out why you would suddenly come to me and agree to be your adopted daughter.

But now it seems that you do have a purpose. Tell me, what do you need me to do?"

Zhang Yuan immediately said:

“It’s simple, I need you to teach me all your witchcraft.

Don't think too much. I learned your witchcraft not to harm anyone. I am not like you who casts witchcraft on others and controls them at every turn.

It might even cause harm to the other party or even their life. I would never do such a thing. I have only one idea in mind when learning witchcraft, and that is to cure diseases and save lives.

I think you should also know that when witchcraft was first created, it was originally a good thing to cure diseases and save lives.

It's a pity that it has been exploited beyond recognition by some people, and now it has become something that scares countless people. Don't you think it's a pity?

So, adhering to the benevolent heart of a doctor who wants to save lives and heal illnesses, I must learn witchcraft. I don't use it to harm people, I just want to save people.

When I wake up every day, the first thing I think about is, have I improved my medical skills today? Will I be able to cure difficult and complicated diseases in the future?

If I encounter some patients who are under witchcraft, how should I deal with it? ? ?

So, in order to make myself stronger and to improve my abilities, I can only learn from you.

I hope my dear daughter understands my pure love for the people of the world and the countless patients who need my treatment..."

After listening to Zhang Yuan's many high-sounding reasons, Guo Nanyue glared at Zhang Yuan speechlessly and said:

"Dr. Zhang, you are such a great and selfless person...

If you want to learn, just learn. Why make it so grandiose, as if you are a great man?

Okay, I can teach you, but I can’t teach you for nothing.

If you want to learn witchcraft from me, I don’t care whether you are a bad person or a savior, and I don’t care what you are going to do after you learn it.

Even if you use the witchcraft I taught you to kill people every day, it has nothing to do with me. After all, I didn't kill the people. If you want to kill, kill. If you want to save, save. It's your business.

I have only one condition, if you want to learn my witchcraft you have to become my disciple, then I can teach you, otherwise there is no way."

Zhang Yuan frowned and said:

"No way, you've already acknowledged me as your godfather, calling me dad all the time, and now you want me to be your disciple? Isn't this confusing the order of generations?

How can a father be an apprentice to his daughter? This is obviously illogical, isn't it? "