Before rebirth, he was the assistant of Mebius.

"The Stone of Truth...little guinea pig, I didn't expect you to be quite thoughtful~" Mebius said with a smile.

"but……"

"But?" Ling Feng asked confused.

"Why do you have a complicated smell again?" Mebius stepped forward and sniffed Ling Feng's clothes.

"Hmm... It's the smell of the Kaya family, right? What's going on, little white mouse?" Mebius said with a kind face.

"We just happened to meet each other in the lounge."

"Well, I know, and then what?"

"Then... I selected gifts for Klein and the others, and then I came to see the doctor immediately." Ling Feng said.

"Really?" Mebius approached Ling Feng and said.

"Really, Doctor..."

"Well, for the sake of your gift, I will temporarily forgive you, for now~" Mebius smiled.

"Doctor, have you eaten well these days?"

"Isn't it too busy, little guinea pig, I can't even eat without you." Mebius seized the opportunity to complain.

"..."

"..."

"Doctor, it's time to get off work, let's go first." After Cang Xuan said this, he took Danzhu off his white coat and took the things Ling Feng gave him and left.

"Okay, doctor, the New Year is in three days. Don't be so busy. I will always be with you. This is the first time we celebrate the New Year together." Ling Feng said.

"Hmm~ That's right, well, let's put the experiment until next year." Mebius smiled.

"Klein, you can take a rest and leave the remaining experiments to next year."

"Okay, doctor."

"By the way, doctor, can I contact the person who had a successful operation?" Ling Feng asked.

"Of course. Why, do you want to test him?" Mebius guessed what Ling Feng was thinking but asked anyway.

"Ah."

"Okay, Klein, contact C027 and ask him to come tomorrow morning," Mebius said.

"Okay, doctor, let me know right away." After saying that, Klein took out the person's information and dialed his phone number to notify him.

"Doctor, I'll inform him to arrive at ten o'clock tomorrow morning."

"Well, thank you Klein." Mebius smiled.

"Then, doctor, I'll go back to the room first," Klein said.

"Ah."

"Okay, little guinea pig, follow me." Mebius took Ling Feng's hand and walked onto the rooftop of the laboratory.

The silvery moon was spotless, silvery white fine dust was scattered in the city, and the white scattered in the air fell on the two of them. They looked at the silvery full moon in the sky and said.

"Look, little white mouse, it's snowing." Mebius spread his hands flat in front of him, and the snowflakes scattered in the air fell on Mebius's hands and turned into dots of crystal.

"Doctor, be careful of catching a cold, you are wearing too thin clothes." Ling Feng said with concern.

"Then...little white mouse, come and hold me." Mebius smiled.

"Okay, doctor." After saying that, Ling Feng stood behind Mebius, grabbed Mebius's jade hand, intertwined her fingers with hers, and placed his chin on her shoulder.

"Ah~ little white mouse, what are you doing? This is... um..." Mebius turned around and was kissed by Ling Feng on the lips before he finished speaking.

After a long time, the two separated, and Mebius was already blushing.

"Little white mouse, you must be responsible for me." Mebius lowered his head and said with a smile on his face.

"Yes, I can, doctor." Ling Feng smiled.

"Hmph~ It's very dangerous to do this kind of thing here. Maybe the scene just now was filmed." Mebius smiled, seemingly not caring.

"Ah? Is there still surveillance here?" Ling Feng panicked.

"Of course I don't have it here, but I don't know about it on the rooftops of other laboratories. What? You don't want others to know?" Mebius asked.

"How could it be possible, Doctor? The person I love most in this world is you, before, now, and in the future." Ling Feng said seriously.

"Hmm~ That's pretty much it. It seems that I really blamed you wrongly..."

While Mebius was talking, Ling Feng suddenly noticed that a black figure seemed to be reflected on the white moon in the distance.

"Doctor...look at the moon. Is there a black spot that looks like a human figure?" Ling Feng frowned, wiped his eyes and looked carefully.

"Huh? What are you talking about, little white mouse? What's there... Huh?! What's wrong with you!"

While Mebius was talking, Ling Feng suddenly felt dizzy, as if he had been injected with an anesthetic, and fell down in a daze.

Ling Feng suddenly felt a sense of suffocation in his heart. The discomfort instantly made him open his eyes, but he found that he could not make a sound, could not control his body, and sank to the bottom of the sea feebly.

But this state lasted for who knows how long. Ling Feng suddenly stopped falling. He could breathe and speak again, but he still couldn't move.

"Where is this? Why am I here?" Ling Feng thought and began to observe everything around him. There were fish and shrimp swimming by from time to time. There was a bottomless abyss under his feet, and the bright starry sky above his head.

"Ling~Feng~" A mature and somewhat charming female voice came into Ling Feng's mind from all directions.

"Who!" Ling Feng looked around vigilantly but found nothing, only boundless darkness and fish and bubbles that appeared and disappeared out of thin air from time to time.

"Well... I know what you want to ask, where is this, who am I, and what do I want to do." Strange voices came from all around.

"Since you know everything, please answer it." Ling Feng said.

"This is the junction of trees and the sea, the gap between imaginary numbers and quantum, the edge of the two spaces."

"The junction of trees and sea?" Ling Feng asked doubtfully.

"But don't worry, I just used a little trick to recreate the scene there. You are lying on the bed in your room right now." A strange voice explained.

"Who are you and what are you doing?" Ling Feng asked.

"I just wanted to chat with you. I didn't expect you to see me."

"who are you?"

"..."

"I have always been answering you. Although I am a guest, it is too rude."

"What do you want to ask?" Ling Feng said sharply.

"..."

"Your eyes have already given me the answer to the question I want to ask."

"?...What Riddler?" Ling Feng whispered in his heart.

"It's really rude, but...that's all, I won't argue with you."

"Can you read minds? Why?" Ling Feng thought to himself.

"Mind reading? You could say that." The strange voice replied.

"You brought me here just to chat?"

"..."

After Ling Feng waited for dozens of seconds, the unfamiliar voice did not appear.

"Hey! Let me go back!" Ling Feng shouted loudly.

"What's going on? How come your memory only lasts for one year?" A strange voice suddenly appeared.

"Who are you? A human or a Herrscher?" Ling Feng asked.

"It's not easy to defeat Honkai. It's just up to you? It's nothing more than a cricket trying to shake a tree... a mantis using its arm as a chariot. Take the important people and escape, hide for fifty thousand years... If you want to survive, you won't be ashamed." A strange voice said with a hint of joking. The tone was mocking.

"You...are the Herrscher?!" Ling Feng asked sharply.

"When you are able to pay the corresponding price, I will answer everything you want to know one by one. Next time I want to see you completely different from now."

"Don't go!"

The strange voice disappeared, and the scene in front of Ling Feng also began to disappear. He wanted to ask something else, but his eyes began to close unconsciously.