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I hope you enjoy it
https://springofromance.com/story/sog/
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I can if you want to.
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Spoiler;
Woojin never really hated Jaechan. Yes, jaechan did a lot of things to mess with Woojin's love life but he never truly care about it. His relationship with Haesol? A contract. He never loved her, it was just a way of using her so the people who are after his weakness (like his stepmom or TaeHoon) would think that she is, given the fact that Haesol looks like his mother (kind of sick).
Woojin has seen (in their first life) how badly jaechan's father and brother treat him and he cares for Jaechan. One of the details that I found cute was that Jaechan loves sweets and chocolate, so Woojin would leave sweets at his desk anonymously from time to time.
Well, the day of the accident, after Jaechan throws Haesol from harm and gets hurt in her place, Woojin slowly comes to the realization that he loves Jaechan. When he has Jaechan in his arms, dying, he suddenly acknowledges that he doesn't want Jaechan to die, that he wants to see him alive and well, that he can't imagine a world in which Jaechan isn't there. But Jaechan dies and Woojin starts to hunt down the terrorist organization that killed him. In the end, after a couple of years from him hunting them down, he finally can rest, but in the process of hunting them he finds that there's a way of using a powerless zone for him to turn back time. When he does, he wishes for two things. To turn back time to when Jaechan is alive and to not remember, because he knows that he doesn't feel anything anymore and he wants to be able to enjoy life with Jaechan.
It was Woojin who gave Jaechan the chance to come back, but it's sad reading that time when Jaechan wasn't there and Woojin was broken and alone. ( T﹏T )
I must admit that I cried when reading the final chapters of the novel. It's the past, when Jaechan dies from Woojin's perspective. I mean, it's not a spoiler but I cried so much reading Woojin's pov. I love those two so much.