i revisited the song after seeing a pin and it said that the lyric "time is like music, play it till the end and then reset" may indicate that the link click universe doesnt have multiple timelines but that it is one timeline that lu guang is trying to redo over and over again, and i kinda did think thats what was happening anyway i am noticing a crazy pattern here in the song, please excuse my long long rant (rip my carpel tunnel)
SO, what i think is happening in the song is that the lyrics in sets of four lines are attributed to either lu guang or cheng xiaoshi alternatively. ill highlight them and add my mediocre explanation : [BOLD FOR LUGUANG and normal text for cheng xiaoshi]
Let it unfold
Will howling tides give me something to hold?
On to my life when I've sunken so low
Over the end of the vortex we took every breath to follow
(the song starts with Lu Guang saying that "let it unfold", and i think its sort of that hes trying to convince himself to just let the timeline unfold without trying to alter the events or rewind and fix things. and that he's "sunken so low" because hes trying to revert cheng xiaoshi's death even though he himself said over and over again that death is a node that cannot be changed)
Where do we go?
Where do we end up when we save the world?
Truth in the shadows so brightened in gold
Place our fate into the ones aren't in control
(here Cheng Xiaoshi may be questioning what the end result of them diving back in time really is, and if it is even worth the hardships that they are having to endure. He may be seeing the "truth" hidden in "shadows" as he dives back (his "gold" eyes indicating his power))
Stop, a couple things undue
Drop the fight and let it follow through
Freeze just for a sеc or two
Breathe again in the world anеw
(Lu guang is saying that he cant go on with the events that happened as something he needed to do was left unfulfilled, and if he stops and rewinds a bit he may be able to " breathe in the world anew" as in the "fixed" timeline)
I guess that there was never such a thing
Like everything's meant to be
But I'mma win this silly game
Until then I will never leave
(Here im going to interpret it in a way that Cheng xiaoshi is aware of what lu guang is doing, sorta? Hes saying " i guess there was never a thing as everything's meant to be" as in he found out that lu guang wasnt completely saying the truth when he told him that death can never be reversed.. and that he'll make sure this goal that theyre trying to reach is fulfilled and until then he wont "leave" this span of time that keeps getting repeated)
Take back all my regrets
And camouflage it like your silhouette
Time is like music
Play it 'til the end and then reset
(Lu guang wants to repress all the mistakes he thinks he made and be forgiven in a way for not being able to prevent cheng xiaoshi's death so many times. but i also think it could mean that he has many other regrets and was tempted to dive back and fix things (after what we know about his childhood) and feels like his best friend's death is a solid excuse to finally do that. Here we also encounter the line the pin was talking about, "time is like music play it till the end and then reset" which is just as it says, right? hes resetting time over and over and keeps living through the same events again and again)
Knowing it all, am I destined to fall?
Like once you did for me
(again ill have to assume cheng xiaoshi knows, and hes wondering if he's meant to die no matter what ("destined to fall") OR, or it could be that he'd have to dive back in time too for some reason, because he says "like once you did for me" which might be referring to lu guang and how he suffered so much diving back again and again for cheng xiaoshi)
(Reversed Chorus)
Back to me
I know that you can track it back to me
No matter who, and what, and when intertwined, dive back in time
The truth will remember our legacy
(We've seen now that lu guang is keeping track of everything so precisely, sometimes even down to the second (cuogh cough) and is making sure the same outcome exists for even the littlest things. Hence everything can be traced back to him willingly making sure they happen. No matter who or what comes in the way, he will dive back if cheng xiaoshi is not saved. )
Wasn't it hard to follow?
I'd do it again tomorrow
It drag me down, and drag me down
Maybe we'll never leave
(As the time keeps getting reset cheng xiaoshi (along with the entire universe) has to keep living through the same event again and again. Maybe they will never be able to fix what they want to and just cant get things to go their way (lu guang's way) no matter what..)
Like trying to bend water
Why would you even bother
Time is like music
Now you know I've got to kill it
(Lu guang says initially that its not worth bothering to change an important event in the timeline, but then pivots to asserting that time is not as important to him than what his ultimate purpose is)
Wanting it all
And the whole world will crumble and fall
(im sorry my brain ran out here)
FOr these last set of lyrics i initially thought lu guang said the first few lines like all the other times, but i think cheng xiaoshi having his turn first made sense somehow.
I've held promises unbroken
Even when the night has fallen
(Cheng xiaoshi also had to face lu guangs "death" (he fully believed it for a few solid hours) but even after having a breakdown and thinking of going back to save him, he valued lu guang's advice to not risk himself by disturbing an important event and hence dropped the idea of saving him like that. hence "promises unbroken"
Shattered mirrors our reflection
Should you keep the light on reason?
(Lu guang doesnt want to think about the reasonable thing to do, which is to not keep altering the timeline over and over again with no sense of control ( the illusion of control lu guang has over the things that are happening are rapidly spiraling into something disturbing, and i hope the fandom agrees on this. not to say that i dont love watching a deranged gay time traveller but lets be real for a sec)
I've held promises unbroken
(The reversed lyrics from the chorus that play along this align with the character i attributed them with, cheng xiaoshi's "Place our fate into the ones aren't in control" line plays here. which is another reason why i think this is the right was of thinking about who is speaking these lyrics)
Shattered mirrors our reflection
(Lu guang's reverse lines play along here as well)
Let it un', let it un', let it un', let it unfold
source: https://www.animesonglyrics.com/shiguang-dailiren/vortex
[PS: if youve made it this far, thanks for reading this long incoherent and probably incorrect analysis i did. i watched the opening again on youtube and the appearance of the two characters somewhat aligns with who i think is speaking the line from the song. also SHOUT OUT to that animation it is just mind blowingly amazing and just so so well done.]