Autumn

How far a spoiler do you want

Yes please

Spoiler ahead for season 3!!

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Don't read if you don't wanna be spoiled.

Okay so next season. The lee sa young from the second world would merge with the lee sayoung from the current world. That's why lsy rn in the last pannel have flashback and say "I haven't had these memories before". So it would feel like having two completely different persona in one body. Where the lsy from another world would take over the lsy current world sometimes and would cry his heart at the sight of J and initiate to kiss him etc basically the another lee sayoung is more bold than the current one. And the current lsy would get jealous at the "other lee sayoung" for touching J and stuff. It would be heartbreaking and funny at the same time (⌒▽⌒)

Thank you so much (▰˘◡˘▰)

I'm not really sure where the seasons seperate and all, and fyi the last dozen or so chaps were locked by pay wall redirected to the korean author's platform (but I know they beat the... what was it?? Creature/being that cleans and collects the dead worlds.) My terminology might be mixed cuz it's been a while. And um. You simply said yes to spoilers, so there won't be a filter to how far ahead.

HUGE MEESY SPOILERS BELOW, SKIP IF NOT READY
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Yeah, the black/white dot in the sky? That's an eye. It originally had two, but J from first turn managed to kill/rid of one eye before dying, so it has a personal vendetta with J for that in the 3rd and last turn. The last eye later starts opening and begin active observation of the world the further it corrodes. So that it can collect/eradicate it for good. It was prevented from doing so 2 times. XD.

The first turn killed un unawakened sa young, as we all know. Plus the world was beyind saving, not knowing what they were up against until it was too late.

And the Second turn? CEJ died because he let himself be killed before turning into one of the white monsters from the "whitening" of the world. in the second turn, it was explained that the further the world corroded in white ashes, people started turning into the very white monsters that invaded their world and attacked. And, unfortunately, due to turning back time, J got nerfed bad in health. Every huge battle, he would temporarily get really sick, and weak enough to be a civilian. Those weak periods let the whitening process work its way into J. And... he was morphing, fast.

Getting weaker each battle, he was diagnosed with days left? Or some very short time, and decided to due human instead from his pride as hero and a hunter. All of this not letting Sa young know of course. He just knew he was very ill and weak after battles.
Sa young awakened in the 2nd turn like the 3rd, but came after J let himself be killed, sending him understandably into despair, because he knew something was up, but not WHAT.

So sa young turned back time with the help of the artisan and the highschool girl (she awakened late in the 2nd turn) with what was left of the broken watch, which is ironic since it wasn't supposed to exist after the one time use J did. (He was too strong a hunter the 1st turn, which let the watch remain after use.) But the hail mary 2nd turn comes to bite J in the 3rd world in the ass.

Not sure if the manhwa got to the part where humans begin turning into the very monsters that attack them, but they do. Was it at random or from human experimentation? I think a bit of both. Depending on timeline and rate of whitening.
But that morphing affects civilians and not hunters at first. For hunters.... they can turn, and by... eating those whitened monsters since a hunter's defenses can't avoid direct ingestion of monster flesh and can only process it into their bodies. That, and as the whitening of the world intensifies, any hunter that is weakened after battle, turns susceptible to morphing (kinda like a virus).

But back to eating the monsters themselves and turning into one. That applies to the 3rd turn most.
Like, they became what they ate. And how they might reach such extremes of hunger? The west sea rift. That's right. J and his team trapped in the rift FOR YEARS didn't die from battle. But by turning into monsters for some after eating too much of the monster corpses. After they got in to the rift, they boss didn't magically showup. Because... the rift itself was simply the portal to the 2nd world, not a dungeon/gate. There was a boss, I think, but the size of the battleground... but a second earth, so imagine finding that before food ran out.

The portal opened because the 2nd world needed J to pay the rest of the price for turning back time a 2nd time. Sa young wasn't strong enough an axis for the turn of time, so our poor J had to finish the job.

So,
After a hunter morphed infront of everyone down the years, J tried to persuade the remaining hunters from not eating the monsters, but were ignored. Only he stopped early on. (Most died off from starvation, while one was eaten... things got dark real quick with no food. Eating the monsters was the only thing available is a world of pure ash and concrete.)

So... here comes the trauma. J decided to kill the remaining hunters. Before they all morphed. By then, every part of them had turned white - skin, HAIR, everything.
(Not subtle forshadowing of J's white hair upon return)

By the end of several years, J wandered the white abyss, less to look for the boss... and more so because he lost his mind to solitude and trauma of murder, and... finally found the darn basilisk. Killing it, he returned.

There's so much more, but this is already really messy, so i wish you luck with this...

Tysmmm! It’s kinda funny tho ≧∇≦

Woah this is a lot (๑•ㅂ•)و✧ tysmmm for the spoilers!!
But is it the third world you’re talking about? Where J killed hunters, killed basilisk (or wtv the name was) and returned to live low?

Yeah. 3rd world is the current world, the one we started with from chapter 1.