https://novelight.net/book/turning
This is the one I use! The later chapters do come out but you’ll have to wait a few weeks for them to become available for free. Enjoy!
I read it here on Webnovel! Forewarning: It is in Indonesian, so if you want it in english you may want to consider a different site to read from. I've reached ch 700+ without anything restricting me from waiting to read further. Sorry for the late reply~ ><
https://m.webnovel.com/book/%5Bbl%5D-memutar-waktu_33515833400049505

Mild spoiler warning provided below. No in-depth specifics. Read at your own discretion.
There are so many hilarious moments that make the novel worth reading. Also gives a lot of insight on some background details that is unlikely to show up in the Manhwa (if said Manhwa even continues, apologies in advance if that's not the proper term for it).
Ch 65 here is precisely ch 103. 66 would be going into 104 [and beyond] in the novel! (On Webnovel, in Indonesian(?))
HERE'S THE MILD SPOILER:
For those of you who want to read to see them 'going at it', I politely recommend going elsewhere. To give a general idea, the time they 'truly' unite for the first time is mid-400s, with two instances prior that didn't go all the way. HOWEVER! All of the experiences that lead up to this point make it SO satisfying to read. Highly recommend it if you can handle rough TL from Indonesian or get your hands on an english TL. ╥﹏╥
While yes, there are a LOT of characters to keep track of (I recommend taking concise notes of important points like I did), they're usually important for further developments within that region. It's a lore-heavy story for those who like depth. *100/10, two thumbs up*