This story is... weird... and confusing.

boy/girl/dude/chick/ u need to reread this..
imma tell you what happend..the main character died he reincarnated as the white haired guy.he met that white hair boy when he was 30.he died after 10 years(when he's 40)i don't know what happend to the white hair boy tho.any questions?
(￣∇￣")

That I know. But the timeline... Timezone or timeuniverse or whatever got twisted.
1. The 40 year old died And got reincarnated into the White haired guy
2. The white haired guy, with the 40 year old soul, meets the original Guy when He was 30 years old.
Now... This is something that didn't happen in the original timeline/timezone/timeuniverse or whatever - AKA the original 40 year old soul didn't meet the White haired guy but this "new" 30 year old version did meet the White haired guy. This encounter changed the original... Setting? Anyway, the history changed... So, how come the 40 year old soul still exists?

that 30 old dude met the white hair boy.
okay,so..mc's car crashed and when he was looking for a shelter he met white hair boy and his lust take over his mind and decided to took white hair boy as a s3x toy(mc is trash).and after 10 years when mc turned 40 he died by a car accident and reincarnated in to whboy's body.since this is happening in the time line 10 years ago,whboy(mc's old self)know after 10 years he will die bt for now...he's trying to get away from his younger self.(￣∇￣")did i make it clear? ╥﹏╥

Ok... Let's go with this:
A = Original dude, who died being 40 years old
B = The current original dude in his 30s
W = the White haired Guy, with the soul of A.

Now, where is the part that A met the White haired Guy (not to confuse with W, I'm not talking about W here), when He was 30 years old? Or that He lives with him for 2 years?
Yes, A died when He was 40 years old but He said He was a playboy, He didn't have a partner (the White haired dude) back then. However, now in this timeline, B met W, thus changing the original life of A. THUS A shouldn't exist anymore, so why does W have A's memories? Is A from different dimension/universe than B and W?

https://www.mangago.zone/read-manga/i_tied_myself_up/uu/d_chapter-1/pg-3/
here-A met white hair boy for the firs time.

A didn't had a partner, white hair boy is his s3x buddy(can't call buddy..A is using him..A is giving white hair boy everything he need cause he is poor in exchange white hair boy let A use his body)people know white hair boy is his play mate.bt don't dare to talk it openly

now in this time line...After A died, he travel back to 10 years ago when the time he met that white hair boy bt now he is meeting himself although i don't know what happened to white hair boy's soul.

bt in this time line, which is now we see B and W same time. After 10 years B will die cause that's what meant to be happen according to the plot.bt that won't happen cause now we have W (aka mc /the same person).and he knows what will happen in the future also B is also him.

the reincarnation happened as a karma(most likely)cause he used that white hair boy.so now he is experiencing what that white hair dude went through.so now he gets to know that he's trash and eventually he will let go to his trash personality.

tho idk mc will fall in love with white hair boy.bt in short this is selfcest ╮(￣▽￣)╭
also i haven't read the novel..so far this is what i understood...feel free to ask anything..oh..again what's with that "2 years" in your reply?where did you see it?(￣∇￣")

In the manga. I haven't read the novel. A's soul in W said that A was a playboy, didn't have a partner and that He reincarnated into "someone named Fang Ye Yin" (ch. 1 pg. 7) - this all indicates to me that A didn't meet the White haired Guy in the original timeline. But if the Story in the novel is different from the Story in the manga then I guess we cleared the misunderstanding.

1.did u clicked that link i attached on my reply?
that fang ye yin is the white hair boy.A's name is Qin Yuefang.so QF meets FYY ch1.pg3.that was the first time he met that white hair boy.

also i haven't read the novel too

Ha ha ha ...you have got some special skill in confusing ...but I have read the novel..and the it's like this .
The black haired guy loved the white one but in the most wrong way and as a retribution he got reincarnated inside the white one so that he would experience what kind of a shit he was ...

It's as simple as that..

do you know what happened to that white hair boy?

Okay listen..dont think too deeply..like I said ..its a fantasy theme..and when it comes to fantasy leave behind logic ..because anything can happen and literally everything is possible..
And I read the novel probably a year before ..so I just remember the relevant points ..
Like this is all karma ..
The seme ( black haired guy ) was damn bad to white guy just because he loved him so one by one he began to suffer and realise once he got reincarnated..

no i can understand what's going on..the thing is..is only the seme got into accident?

So A (seme from the past/future) did meet the White haired dude before his death and they were a couple...

So... Timezones and dimensions aside... I don't understand his (A's) way of thinking... ╮(￣▽￣)╭
I mean... He became W (White haired Guy with A's soul), he had the memories of A, He could easily avoid the situation he's in now (being the posesion of B - the "new" version of dude A in this timeline) - just don't meet B from the beggining... like... Did He think that He treated the White haired Guy well enough in his previous life, that He decided to stay as W with himself - B - in this new life? Then why was He surprised when He met B? And if He hates B, He can easily mess things up - since He knows everything about B. So why doesn't He... I don't know... Rob him and run?

... Maybe I'm thinking too much. (⌒▽⌒)

lmao..yh u kinda think too much..it's just don't think too logically.the reason W coudn't run away from A was because that time when they two meat each other for the first time was also the time B reincarnated in white hair boy's body.yes B think he's doing nothing wrong..cause he's giving everything to wh boy.A is trying to run away from his younger self rn cause in his 40's he know what he did was wrong.it's most likely as a karma..that's why he reincarnate in whboy's body ╮(￣▽￣)╭

If you haven't read the novel then one should assume that the picture you linked to is clearly showing W meeting B for the first time. W's surprised look when he meets B in that cave, then the brief look into the past at how he arrived at that cave, would not only be proof positive of that fact but would also make it clear that A had already reincarnated into the white hair boy's body, long before he met B in that cave and that A has no memory of ever meeting the white hair boy by that point, at least if we're only gathering info from what's been portrayed in the manhwa so far. This is why Niki is confused by what you're saying.

If A had amnesia that would answer their question simply.

The reason things are fantasy is because they're based on reality. Does a black block look darker against other black blocks or against white blocks?

OH..SO that's why niki's confused..well i'm glad if this will help her to clear the situation. although i haven't read the novel,so far i could understand everything.also this is the first time i have read something like that.

anyway i hope niki will able to understand the situation(づ￣ ³￣)づ

also thnx kind stranger..may be no one noticed this..bt for now..this is the most popular comment in the section(⊙…⊙ )

#－.－) In what moment/page in the manga/manwha (ch. 1-5) did you find out about their meeting in his previous life?

Anyway, yes, I understood the concept after the explanation of the novel from Omniscient Dokja.

Oh actually the thing is you have no idea how cruel he is ...
As far as I remember that guy broke the white guys leg just because he tried to run and broke a piano because he refused to play ..

He is one among those psycho..paths in urgent need of therapy or even jail ..
Plus he even threaten to kill his parents ..and it's no mere words..he would do anything just to make the white stay ..

Also the black has lots of wealth and white is very poor..so you see ..

He is like " I use my money to screw others life "

Ah... Great... This manga goes right into the list that contains Killing stalking and Hogu Hagyeongsu.