One night three days later, at half past seven, Yun Tian and Yan Jun made an appointment to go to the library for self-study.

In the past few days, he has always been a little sluggish, and his soul is not giving up, as soon as he calms down, Lan Xin's appearance will unconsciously appear in his mind, and in his heart, there seems to be something that has been silent for a long time is quietly breeding.

Yan Jun worked very hard, even on the way to the library, he was still talking to Yuntian about some biology subjects.

didn't know that Yuntian's thoughts had already drifted out of the clouds, and it wasn't until he felt that the other party suddenly stood up, and then he woke up to look at the surrounding environment.

What is the narrow road of enemies, this word can be used not only for enemies, but also for lovers who can't explain each other.

Yun Tian looked at Lan Xin in front of him in a daze, and said in his heart that he was really afraid of something, how could he speak.

Just after Yun Tian's expression changed three patterns in an instant, Yan Jun beckoned, "Senior Sister Lan Xin, what are you going to do here?" ”

Lan Xin glanced at Yuntian and said with a smile: "Today Wednesday, I am going to the laboratory building to help Professor Su clean up the laboratory. ”

Yun Tian's ears pricked up suddenly, and there were only five words left in his mind: Clean! Court!

Yan Jun was about to say goodbye, when he saw Yun Tian's expression unnatural and said, "Sister Lan Xin, you want to ......, or I'll help you." ”

"......No, no, no, you can go and study." Lan Xin hurriedly waved her hand.

Yun Tian didn't know where he got the courage to step forward and push Lan Xin and said, "Sister Lan Xin, if you ......, don't be polite to me anymore, let's go." ”

In this way, he half-pushed Lan Xin away, leaving Yan Jun stunned to watch the two of them go away, he lifted his glasses and left only two words: "Beast!" ”

"Yuntian, you really don't have to come along."

"Sister Lan Xin, just ......, let me help you, so that I can express my gratitude, and I can feel more comfortable." Yun Tian replied with a bitter face.

"You! Well, you've got all the work for today. Lan Xin smiled.

On the way to the test building, the two finally let go of the previous mustard and chatted naturally.

Entering the laboratory building, the laboratory of the Department of Biology is on the fourth floor.

Yun Tian hadn't been here before, and when he walked to this floor, he looked curiously into the windows of each laboratory.

It's already off-duty time, and it's empty, and there's not a single human voice.

Lan Xin opened a door in the middle of the hallway and walked in, followed by Yuntian.

It was a small laboratory, fairly clean, but untidy, with a bed in the corner, no quilts, bottles and cans scattered everywhere on the test bench, and a strange smell of potion permeating the room.

Lan Xin put on her own protective clothing and gloves, and also threw me a set of Yuntian and said: "Try not to touch the skin directly when cleaning these bottles, because I don't know the ingredients in them, and the cleaned water is collected into this bucket, and you will be responsible for pouring it into the sewage treatment outlet at the end of the corridor later." ”

Yun Tian nodded, put on protective clothing and gloves like an apron, and stood next to Lan Xin.

The two of them silently brushed the bottle, occasionally looking at each other and smiling, like a couple of lovers busy with dinner in the kitchen.

Yuntian suddenly regretted that he didn't put a romantic song on his phone, and it must feel great when it was broadcast at this time

Time slowly slipped away in the ambiguity of this pediatrics, and when it was almost half past eight, the door of the laboratory was suddenly pushed open.

It was Professor Su, who was carrying a delicate lockbox, and as soon as he entered the door, he was visibly stunned.

"Why are you here?" Professor Su looked pale, and his mood was a little impatient and uneasy.

Lan Xin hurriedly replied strangely: "Professor Su, are you okay, didn't you ask me to come over every Wednesday to clean the laboratory?" ”

Professor Su took a moment, his face suddenly showed a sudden look, he patted his forehead and barely squeezed out a smile and said, "Oh! That's right, I've been busy forgetting lately, I'm really sorry. ”

He turned his face to look at Yun Tian again and said with a smile: "Did you bring a little boyfriend to help today?" Oh well, I'll pay you double today! ”

After Professor Su finished speaking, he took out a hundred-yuan bill from his wallet and said, "Take it, you can go back quickly." ”

Lan Xin hurriedly shook her hand and said, "No, no, you can't change what you said, I'll find you 50 yuan." ”

Professor Su looked around the neat laboratory and sighed and said, "Lan Xin, take it, even if it is your reward for so long and hard work, every time I see you, I can't help but think of my daughter studying abroad." ”

After speaking, he stretched out his hand, patted Lan Xin's head, stuffed the money into her hand, and pushed the two out of the laboratory in a hurry.

With just such a move, Professor Su was tired and sweaty, and his face became even paler.

Lan Xin turned around and asked with concern, "Professor Su, how is your body, you should pay more attention!" ”

Professor Su looked at Lan Xin, was silent for a moment, and suddenly showed a smile, he nodded and said to Yun Tian: "Young man, Lan Xin is a good girl, if I am not here, you must take good care of her." ”

"Huh?" Yun Tian was stunned for a moment, and he didn't know what to say for a while.

"Professor Su! Don't talk nonsense, you must be well, your illness will be cured. Lan Xin looked serious.

Professor Su seemed to have let go of everything at this time, and suddenly showed a relaxed smile and nodded with a smile: "I will work hard!" Don't waste your time with me, the laboratory building is about to be closed, so hurry up and go back. ”

The two nodded, threw their apron gloves into the bucket, and said goodbye.

Walking down the long corridor, neither of them looked back, but they could feel that Professor Su was still standing there watching them.

After a while, the sound of the door closing sounded, Yun Tian and Lan Xin couldn't help but look back, and the corridor was calm again.

This laboratory building has five floors, and the elevator is not open at night, and the two of them go down the stairs.

At this time, it was quiet everywhere, the lights in the stairwell were dim, Lan Xin leaned over Yuntian with some fear and said: "I used to come every Wednesday in advance, just because I was afraid of walking the stairwell alone, if there was no delay today, it wouldn't be so late, fortunately you are here." ”

Yun Tian laughed twice and asked, "What's the matter with this Professor Su?" ”

Lan Xin said as she walked: "When I first entered the school, Professor Su temporarily served as our counselor for a period of time, and he was very amiable, knowing that my family situation was not good, he gave me this job, in fact, he didn't need it at all. Professor Su has a daughter, who is studying abroad, and his wife died a few years ago, but he himself is seriously ill, but he has always been happy, and he is very optimistic, maybe he has encountered something recently, and his temper has become strange. ”

"Oh." Yuntian listened quietly.

Lan Xin glanced at Yun Tian and said: "Every time I see Professor Su, I think of my father, there is really a big gap, sometimes when I chat with him, he always can't help mentioning his daughter, and he will have a proud smile on his face, and he has been hiding from his daughter about his own illness, and wants her to study there with peace of mind." ”

Yun Tian stopped and couldn't help but ask, "Your father is ......." ”

"I don't want to mention him. It was my mother who raised me with hard work and provided for me to go to school, so ah! I want to earn more money, reduce the burden on my family, and let her live a good life in the future. Lan Xin's words were full of strength and confidence.

Yun Tian nodded, and was about to say something, when he suddenly heard a bang downstairs.

The two glanced at each other, and Yun Tian secretly screamed that it was not good, it must be that the administrator had sealed the door.

He rushed downstairs first, followed by Lan Xin.

Running to the door, Yun Tian patted on the door and saw that the administrator had already pedaled his electric car and drove away.

Patting the door in annoyance, Yuntian asked, "What should I do?" ”

Lan Xin smiled bitterly and said, "Professor Su has a spare key there, let's go get it, I see that this staircase is gone in vain." ”

Yuntian said, "You wait, I'll go up and get it." ”

"Wait ......, wait a minute." Lan Xin said with a ruddy face.

"Huh? What's wrong? Yun Tian asked.

Lan Xin looked away and said, "I was nervous just now, I was ......, my stomach was uncomfortable, and I wanted to go to the bathroom a little, can you stand outside and wait for me for a while?" We'll go up together later. ”

Yun Tian wanted to laugh in his heart, but he couldn't help it, and deliberately pretended to be very normal and said: "It's me who is careless, then I'll wait for you, and when we go up together, we should exercise." ”

The two walked to the bathroom on the first floor, and Yun Tian watched Lan Xin walk in, and he also made it convenient by the way.

After this, there was a delay of more than ten minutes.

When they walked back to the fourth floor, it was already past nine o'clock, and Yun Tian said, "I don't know if Professor Su has rested." ”

Suddenly, there was a terrifying roar in the hallway, followed by the sound of the glass of the door panel shattering.

After that, all the sound stopped abruptly, and there was only a deathly silence.