Since I don't know the story, I can't tell you the main characters. They could be ordinary people trying to survive the 15 days of darkness.
Without having read the '15 days of darkness story', it's impossible to name the main characters. However, in a typical story like this, they might be a group of diverse individuals such as a scientist who tries to figure out what's causing the darkness, a brave leader who tries to keep people together and safe, and a young person who discovers some unexpected truth during the 15 - day period.
I don't have enough information about the '15 days of darkness story' to determine the main characters. But if it's a story about a community during the darkness, the main characters could include a local mayor who has to make difficult decisions to ensure the survival of the town, a mother who is trying to protect her children, and a hermit who has some knowledge about the oncoming darkness and how to deal with it.
A practical answer is Chapter 104, because it turns the idea into a concrete scene. The chapter opens with Zhao Lang let out a light chuckle, "Young Master Jiang, don't be nervous,..., adds pressure through just let me rest for a few days, just a few days..., and ends on Despite a whole day's.
If you want the clearest chapter reference, go to Chapter 101. Early on, Jiang Li walked over to the slope where the two had fallen down.; later, the chapter leans on Below the small hill was nothing other than a large patch of sludge..
If you want the clearest chapter reference, go to Chapter 96. Early on, Jiang Li's words seemed absurd, yet there also seemed to be a trace of...; later, the chapter leans on Her hand holding the phone began to tremble uncontrollably..
The best chapter pointer here is Chapter 111, "From now on, Zhao Daniu is my new brother!". It opens with The main room's door was pushed open just a crack, and the head of the... and closes on This time it was in a dream..
Chapter 66 is the strongest chapter-level answer because it starts from I can't take it anymore, why did the young master even find a pair of... and follows through on Unable to find a staff member to notify, and not wanting to waste time for....
Chapter 71 is the strongest chapter-level answer because it starts from Shu Yan curled her lips with a hint of jealousy, "When can it be my turn... and follows through on Now they had to work on an empty stomach..
Look to Chapter 119 for the clearest answer. It begins with What is Princess Wen talking about?, keeps building through I can't understand a word?] [Is this some new meme?] [!!!, and lands on For some reason, he always felt there was a mysteriously calming power....
The best chapter pointer here is Chapter 67, "You Can Still Pick Mushrooms?!". It opens with I'm pissed," Jiang Yan cursed again, "These people are too much, aren't... and closes on Accompanied by the wisps of smoke gradually rising from the stove behind....
Look to Chapter 106 for the clearest answer. It begins with Thinking of this, He Yun nodded with a hint of anticipation., keeps building through Alright, then tell me my fortune, what do I need to do?, and lands on Jiang Li's fingers lingered over the three copper coins, her clear voice....
Chapter 115 is the strongest chapter-level answer because it starts from Jiang Yan was woken by a loud crowing noise. and follows through on [Pure bystander, wasn't Jiang Yan known as a notorious playboy?.