Let me make it short.

【I am speaking to you through the system.】

So what happened to you?

The soul is merging with the body.

[…What do you mean? Did you just remember that you're not the original Si Jingyu?]

[No, I am Si Jingyu, but I have lost one of my soul.]

Su Qingzhu frowned, a light flashed in his mind, but he didn't catch it. [Where did you find that soul?]

Si Jingyu said succinctly: [In the Zombie King's crystal core.]

Su Qingzhu's mind exploded with a "boom", and he finally caught the light.

I see.

No wonder the crystal core flew into his brain on its own. It turns out there really is a soul inside it.

She remembered the red light flashing inside the crystal core when she first saw it. That red light must be the color of that soul, right?

She asked: [So you are the Zombie King?]

Si Jingyu thought about it and gave an ambiguous answer: [Yes and no.]

Su Qingzhu was confused. [What does that mean?]

"I only have memories of him as the Zombie King, not as a human." Si Jingyu explained.

Su Qingzhu thought to himself: [Maybe your brain was damaged by the zombie virus invasion, but that doesn't mean you're not that person.]

Si Jingyu laughed, [No, I can feel it, I am not him, just the Zombie King.]

[……]Su Qingzhu didn’t know what to say.

It is difficult to change a person's ideas, just like you can never wake up a person who is pretending to be asleep.

Si Jingyu determined that humans and the Zombie King were different.

However, maybe he is right, but there is no way to verify it.