Southern Archives: Xia Zai, I’m Here to Repay What I Owe You

[Southern Archives + two powerful leads + apologies for OOC + original elements + mystery-solving + fanfiction] For many years after Xia Zai left, Zhang Haiyan regretted it more than once. He regretted his reckless youth and his failure to watch his words, which led to the destruction of the Southern Archives and cost Xia Zai his life. But what he regretted most was sending Xia Zai to Nanyang. If Xia Zai had never gone, he would have become the successor to the Southern Archives and lived a life of his own, instead of constantly cleaning up Zhang Haiyan's messes, only to meet an untimely end. It's true that life is full of partings. But that person was Xia Zai, his closest family, his dearest friend, his beloved. If only time could turn back. He would stop everything from happening, spare Xia Zai every hardship, and ensure he lived in peace and safety. So when he saw the words "Reverse Time and Space" carved on the coffin, he climbed inside without hesitation. He just didn't know whether he could truly return to the past, or whether he could really change their fates.