The person who set the fire upstairs could not be Shang Qi or Chu Jin, as this building was chosen by her.
As for Shang Qi and Chu Jin, they were responsible for the other buildings.
This meant that the arsonist was another survivor besides them.
As for the reason for the arson, it was probably because the arrival of the three of them disturbed the peace here.
Or, it alerted the survivors here and put them on guard.
However, that didn't make sense.
If it was to alert and put them on guard, there would be no need to set a fire to attract attention.
Because once a fire was set, it would inevitably draw attention.
If they didn't want a confrontation, they could have quietly left without a trace, and they wouldn't have been discovered.
Moreover, even if they had met face to face, as long as their interests were not threatened, there would be no conflict, and they would not interfere with each other.
Since a fire was set, it meant it was the work of someone from within the pharmaceutical factory.
The motive for doing so was to prevent Su Ling and the others from taking possession of the factory's medicines.
Furthermore, this insider was very likely the person in charge of the factory.
After all, ordinary employees wouldn't care if the factory's medicines fell into the hands of others!
Su Ling stood at the entrance of the corridor, looking up. She drew the Tang saber, which she had put back in its sheath, and then walked upstairs.
From the first floor to the second floor, Su Ling found no target. She continued towards the third floor.
The medicinal scent was coming from the higher floors.
Su Ling followed the medicinal scent upstairs, all the way to the fifth floor, and stopped in front of a door that was slightly ajar.
The smell of burning medicine was emanating from this gap.
Su Ling used her Tang saber to push open the door, and the smell of burning medicine intensified, becoming so strong it was choking.
Moreover, the entire fifth floor was filled with thick smoke, obscuring visibility.
Su Ling stood at the doorway with her Tang saber. The situation inside was dangerous and not suitable for entry.
After confirming this, Su Ling took a step forward and slammed the door shut with a 'bang'.
Then, Su Ling quickly turned and headed upstairs.
The fire would quickly spread to the floors above and below. What she needed to do was to run upstairs and clear out all the medicine on floors six to eight before the fire spread.
Afterward, she would need to quickly go downstairs to the fourth floor, and from there downwards to the third and second floors.
After Su Ling turned and headed for the sixth floor, she disappeared from the corridor. The door she had slammed shut then opened by itself. It opened briefly, then slowly closed, leaving a small gap.
The atmosphere was so eerie that it made one's hair stand on end.
It was a shame Su Ling had already left and was not present, or she would not have missed this scene.
After the door slowly closed, everything returned to a semblance of calm, with only thick smoke seeping out from the gap in the door.
Su Ling was very efficient and quickly completed the sweep of the three floors above the fifth.
After she finished clearing out the upper floors, she quickly went downstairs and ran towards the fourth floor.
As she passed the fifth floor, Su Ling paused. She looked back at the door that was ajar.
If she remembered correctly, when she went upstairs and left, the door on the fifth floor was closed tightly.
She had closed it with force, with a loud 'bang'.
Therefore, it was impossible for the door to have been left slightly open.
Then there was only one possibility, and that was—
After she left, a survivor came out from the smoke-filled fifth floor.
And this survivor was quite capable of staying in such a choking environment for so long!