
The novel I just read now already have a manhwa adaptation.. ╮( ̄▽ ̄)╭

Spoiler Ahead
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I don't want you miss the fun but I will show the bigger picture. First, his relationship with his former students is so MESSED AND ANGSTTT. But don't worry, it will show later, for now enjoy the drama to adapt with his new life. His life will be focused on restoring the glory of the White Tower and investigating why he end up in this body. And the current 'problematic children' of White Tower will became his team! (^_^)
For now the novel still have 184 chapter if I'm not wrong.. So the mystery haven't truly revealed. And the most important things, I didn't found any romance up until now. Sure there will be some woman but hell, he's so professional and think them as a student or children lol

Answer
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As far as I remember (if I'm not wrong), in the novel, the Demon Emperor truly die (the one who watch the life of others will explain it to MC. To put it simply, he used the concept that a person's life shines like a star, and the Demon Emperor's star had disappeared.), BUT there's a room for doubt because in the future conflict our MC will meet another demon and also their followers. And yeah 184 chapters is too little , I regret reading that!!! I mean I can't sleep that day after finishing those chapters. There's so many questions unanswered especially around his former students damn
What a trash father //sigh