One possible theme could be redemption. As mentioned before, if a character has done wrong in the past, the idea of being brought into the light can symbolize their path to making amends.
Another theme might be hope. When a character is in a dark situation and is asking to be brought into the light, it shows that there is still hope for a better future, even in the dark and dangerous world of Buffy.
A third theme could be friendship or love. It could be that the power of these relationships is what brings a character into the light. For example, Buffy's friends might be the ones to help her out of a dark place, highlighting the importance of these bonds in the face of darkness.
Chapter 848, "Just an Adopted Daughter", is the clearest early answer because it turns Gu Shengrong's situation into a concrete plot event.
Chapter 867, "Then what does our child count as?!", is the clearest early answer because it turns Jiang Meng's situation into a concrete plot event. The chapter turns that into something concrete by moving from Lili's brother, Chen Nanyu, was the only ray of light in his dark...
A practical answer is Chapter 37, because it turns the idea into a concrete scene. The chapter opens with The barrage was suddenly filled with hahas, but the two guests present..., adds pressure through The moment her gaze landed on her, she couldn't help but pause., and ends on I look forward to.
The best chapter pointer here is Chapter 26, "Sending My Big Brother to a Transformation Variety Show". It opens with Shen Lan was bent over processing a large stack of press briefs on her... and closes on If you think you can use our family connection to have me handle this....
The best chapter pointer here is Chapter 28, "Beaten Up Again". It opens with The next evening, Jiang Yan drove home seething with rage. and closes on Lili then kicked his knee hard..
If you want the clearest chapter reference, go to Chapter 23. Early on, Although Jiang Li exerted very little strength, Jiang Yan instantly felt...; later, the chapter leans on The pain twisted his face grotesquely as he dove headfirst into the sofa..
A practical answer is Chapter 5, because it turns the idea into a concrete scene. The chapter opens with Actually, when Manager Fang saw Jiang Li, he was somewhat surprised., adds pressure through How the hell did you get in?!, and ends on Recently, he did suspect that his wife was cheating on.
Look to Chapter 27 for the clearest answer. It begins with They had spent an entire year gradually inviting a few people., keeps building through The pressure they endured during this period was beyond words., and lands on Yes, I'm sorry." He nervously twisted his hands, "I was impulsive.".
Chapter 884, "Master?!", is the clearest early answer because it turns Senior Brother's situation into a concrete plot event. It opens with I've heard this temple is quite magical, but why are there so many... and closes on After all, Master often goes on retreats, leaving the teaching to the....
Chapter 938, "When Did the River Moon First Illuminate People? [Extra · River Moon Chapter]", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.