
https://www.mangago.zone/read-manga/fire_king/
The link is here! I think it matches everything you have asked Apart from the fact that it's a yaoi. The novel is, but the manhua isn't. Again I haven't read it yet so I don't know the exact content it's just I accidentally found the explanation so I think it matches your summary.

Noo it was definitely a chinese manhua, and it's bl only, and back than in the Website I was reading it " I tied myself up" and that manhua was uploaded at the same time and i felt the characters were similar and storyline were a bit similar except the flower part so i remember it , after all those yrs " I tied myself up" was translated so I was hoping that manhua to be also atleast translated and uploaded somewhere i really wanted to know how it ended,it sucks my stupid ass brain can't recall the name

Just the MC with long hair and blue eyes and the ML with black short hair and red eyes, the ML was pretty was neglected as a kid and yk how it typically is the MC saved him he became obsessed so ML worked hard to be some big person than he kept the MC hostage, than the wedding night happened and when the MC went to the other world he became a teenager again when they were both in high school probably but this time he decided not to save him but the ML is still obsessed with him in this universe, tbh it's hard explaining the ML because the ML is the og world is alive and than there's the teenage ML I hope I'm not confusing u, I think the MC was some sort of researcher in the og world and helped the ML because they loved eachother but than ML probably wanted the MC to rely on him and not leave him so he locked him up and all and got married to some other person as I've said before, and also the last chapter and scene I read for that manhua is when the ML and MC are taken to a base kinda place by the ML uncle's and i think the ML didn't had parents, I'm just saying as much as I remember

Hmm... Okayy another question do you if it's on his website have u seen it here before? Do u recall the mc hair color? Ik u said blue eyes but i didn't give me a hair color so . Anyways uhh also do yk if it's like a modern manhua or yk those historical ones cause that also impacts. (I've been searching left and right ) And you said spider lilies also impacted the story right? Do you think it would be apart of the cover or something? I just need to know cause I hit a dead end again searching everywhere (on this website specifically) and is it similar to this manhua? (I even looked up manhua similar to "I tied myself up" and hit a dead end again .)

It was some other website but later on that website started having too many ads and also they made readers pay to read the chapters and also changed the website name and how it looked, it's a modern manhua and i don't think there were any spider lilies in the cover,i don't remember seeing in the cover (i hope I'm not wrong )and yk like we can guess the plot for some manhua and all through their names, that manhua name didn't suggest time travel and stuffs like that, MC had white hair
Does anyone know the name of manhua similar to this the main character's look a bit similar but the MC has longer hair, i don't remember it nicely because it's been years but the ml locks up the MC and Ml marry some other girl for political reasons but he spends the wedding night with the MC and the Ml wife with her lover the MC can't stand it anymore and kills himself on the wedding night by burning the place he falls into a bunch of red spider lily which is a drug being grown by the Ml than MC reincarnated in another world which is somehow related to the red spider lily and he reincarnated into his younger self and their he meets the young Ml but the real Ml in the orginal world is still alive and trys to find a way to bring back the MC and somehow among all the flowers the got burnt in the wedding night only one didn't burnt so he keeps it cuz his sure that the flower and the MC are somehow related and a few chapters later he talks to the MC from his world to the world where MC is at currently through a mirror