Oh flow, i love that serie. It made me feel so many emotions. It was such a great webtoon. You're right the art style does remind me flow.
Well thats cus the author of this story is the one who made Flow lol. They're made by the same person.
And actually there was a reversal in time in Flow too, at the very end. The mc had to go back in time and save the child of the Phoenix, so that the upcoming disaster and chaos would be prevented (w/the Black Turtle and all that) bc the child of the Phoenix's death caused the chaos to ensue. It costed the mc's life but the child of the Phoenix used his wish, and wished for the mc to be revived/safe, which caused the Phoenix to go dorment for the rest of the child's life. Or something like that. Been a while.
This reminds me of every wattpad I story I read when I still in middle school, except the rewind time part. I'm reading this for the sake of art cuz it reminds me of Flow (a cookie whoever remembers that webtoon)