So, the big secret of the system was that it was created by a cultivator who became a god and ascended to the god world. However, another god died and its remains fell into the universe and into the parallel Earth (where the MC traveled in time to) and became a starlight stone. This massive energy caused humans and animals to mutate and grow an additional thing in their brains which later gave them mental strength. Animals took to this energy much better and faster than humans, thus becoming super strong and massacring the human race. After years of fighting, a group of government and rich people built a spaceship and decided to abandon Earth because an SSS level monster appeared that no one could fight. So they all board the spaceship and fled but also nuked Earth after leaving because they wanted to kill the SSS monster. They were in space for about 100 years before finally colonizing another livable planet. Anyways, it turns out that the stronger someone's mental strength is, the more they feel a voice calling out to them. Apparently, this is the god calling them and giving humans mental strength was all a ploy in order to resurrect him. He lured strong humans to work for him and eventually they created a body so he can be revived. At the very last chapter, the humans were fighting against the god's army and then the MC goes deep into the lair with our ML (the emperor), and fights the god eventually winning and saving the day. And then that's it. You don't see her go back to her original Earth like she was supposed to. Because what happened to this world will also happen to her original world so MC was saying before that she'll use the system to go back in time when the god first died in order to save her Earth etc. But that never happened.

You also don't see her interact at all with ML. They basically just met once when she was still a student and poor so she was trying to mine energy stones for the system and saw ML killing a lot of star beasts. That was their first meeting. Then you see ML pop up here and there under different names because he didn't want people to know he was the emperor. But whenever they met, there was no blushing or heart skipping etc. Like, they just talked a bit and that was all. Then the time skip happened and she's suddenly a general and the author just summed up their interactions as ML reaching out to MC now and then via messages etc. Just like a normal friend. Even at the very end when they both went to find the god, ML was just basically a compass to find the location and MC was the one doing the fighting. There was barely any ambiguous atmosphere between them when they were together. So how did I know it was the ML? Because the author literally wrote a comment that the ML appeared when we first see him.

There's a few other little things that I could see were ideas the author wanted to expand on but then it was never completed because they ended the novel so quickly. It's very disappointing for me to read this kind of conclusion but it is what it is. If you read this and still think you might like the novel then you should go ahead and read it. It's not a bad novel at all, it's just the ending was too disappointing.