So I've been re-watching Bridon Arc, and a couple of things came to mind. Some of these have previously been discussed, I think, back when the season aired, but I don't remember now, sorry. 

First:   
\- LX tells XF in the movie theater after XF says that he'd like to end his cooperation with LX (spying on CXS and LG) that if XF had stayed a bit longer, he might've seen something interesting, as if he knew what would happen.  
\- He wasn't alarmed at all when he heard XF receive the news of Vein's death.   
\- In end, presumably LX opens the bag in which Vein's body is kept.   
\- When Vein gets the heart attack, he's surprised.   
What I'm thinking based on these points, and that LX "can control heartbeat", is that LX had prolly made a deal of some kind with WQ and helped in Vein's heart attack. (the 'how' is interesting ofc. Somehow has to do with reciting a person's real name and WQ's own powers?)  
(only for LX to later also revive Vein (or not really cause a true death, let's say), so he tricked WQ, although, I'm thinking WQ took the diary with her)   
(and because Vein's didn't know of the 'deal', he later has a quarrel/fight with LX. We saw something like that in a trailer/PV, I think?)   
Any thoughts? 

And second, last time I thought lu guang was hoping that in causing a little shift in events, he could cause a major change. However, only this time am I wondering how could LG have predicted/hoped for such a MAJOR shift? Like, how could he have expected that delaying Vein's entrance to the room in which CXS and WQ/CXS's mom were could even \_potentially\_ result in a major change to Vein's life? The things he says to Vein and the way he acts, with his smile and "hope I never see you again" makes me feel like he's not trying to make any random change, but that he's kinda calculated things. Which is SO interesting. Did he know about this deal between WQ and LX? Which also takes me back to a discussion I'd had in a post recently: just how much does LG know? He acts like Vein's the only problem for his goal of living a peaceful life with CXS and QL, but he also acts like he knows other things. For eg., in BA, he seems to know LX. And given that Vein in the first episode of BA (during the fight at time studio) tells them that they shouldn't have changed/messed with the past, I'm thinking CXS and LG must have done something, which means that that they prolly knew more about the organization and stuff. Lu Guang is such a mystery.   
Sth else just crossed my mind: if he really calculated that move, he must have known about the beef between Vein and WQ - that they would fight. Perhaps this is just a knowledge carried from previous timelines, though. 

And I wonder what had happened in the original timeline. Exactly what change of the past the main trio had made. It also involved a fire, iirc the starting scenes of BA. I wonder if even that was related to the same Bahati fire of BA, or something else. But CXS shouldn't have gotten more involved in the original timeline, right? Since he made the promise with his mom. Unless sth happened to this mom? Assuming that the trio made some changes to say, prevent the Bahati fire, then, the fact that Vein says they shouldn't have messed with the past implies that Vein likely was involved in the fire incident. However, then he'd know the cause and that would contradict his reactions in the BA. Which means, whatever change the trio had made to the past in the original timeline wasn't related to the Bahati fire, at least not directly. But sth to note that might go against this theory is that in the time studio fight scene, there are moments (if not the entire time) that Vein's eyes are not shown. So was that someone else possessing Vein? 

And sth I thought about for the very first time: LG says, "if there's...an unchangeable point \[before the death node\]...no need to fear the deviation, just let it happen more completely" while talking to vein about the butterfly effect. So, he considers this event of vein's interaction with WQ to be an important node that led to the death node. 1) some thoughts as to what I should make of this are coming to my mind but I haven't yet completely thought about, haha, and 2) assuming that in the original timeline, there was no delay in Vein walking into WQ's office, and therefore, who Vein met was CXS's mom only, not WQ herself (therefore the event not happening "completely"), then, Vein should've walked away with the diary => this diary was important in some way as a cause of CXS's death? (perhaps related to the 'change' the trio had brought in the original timeline?)  
  
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Just to make a note of what the characters seem to be after in BA: 

\- CXS's mom: prevent CXS's dad's death   
\- WQ: cause of the fire; has good relations with CXS's mom  
\- Vein: the diary (and presumably, the cause of the fire); seems to be in bad terms with WQ, and the two may have opposite goals given that WQ tried to protect the diary that Vein fights for; interestingly, when LG tells him that he's thinking of changing a destined ending completely, instead of wondering that LG could have some powers, Vein instead simply says that LG might be the one in need of therapy, which just seemed quite odd, because it's hard to believe that Vein is unaware of the existence of powers.   
\- LX: about Cheng Weimin (and let's assume also the cause of the fire); he seems to be helping Vein, but also might have had some connections with WQ in the past; if the 'deal' thing is correct, then LX wasn't interested in the diary (since WQ walked away with it)? But then what's his connection with Vein? Interesting.  
\- XF: no apparent goals, but was prolly a student of Bahati; and seems to be - to an extent - in the loop with LX and Vein as far as the fire is concerned, but otherwise prolly unaware of the others' goals

I think we can also assume, btw, that the diary doesn't contain (much?) information about the fire, otherwise WQ would prolly have figured things out by now. (this could also explain LX's possible lack of interest in the diary itself.) So, 1) the diary contains top-secret, important info related to the organization?, and 2) Vein's not really interested in the fire? Perhaps he's just a mafia boss that acts on behalf/on order of the organization? (though kinda difficult to see him being bossed around)  
  
And finally, can someone please remind me if the date on LX's phone while he's playing was an error? (it says 2024) Btw, his game of tetris is ..interesting. 

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Separately, let's do a fun game of what you think LG's (and therefore Vein's) answer to the forest fire problem prolly was? Also, what/who do \_you\_ think the cause of this fire was? :)

Couple of thoughts related to Ep 6 events of BA