This novel is very similar to another "modern setting" novel by the same author. In fact, a lot of the plot were borrowed, but less polished.
After "tricking" his users into liking this novel and get it on the shelves (where the author would be paid) the author changed the theme.
The MC will go to other plaines and the story will be changed into your average cultivation harem story. IE: there will be a lot of recycled plots in this order:
MC finds the entrance to another area/plain. Leaves everything behind and goes there. Finds himself extremely weak compared to the others in that area.
Strong opponent appears who is interested in MC's treasures and/or girls.
MC escapes is constantly in hiding and escaping.
He finds some treasures (usually in some auction) and resources, trains, levels up.
Immediately there will be some anonymous opponents which will be offed by MC.
MC defeats all his previous opponents. Opens up a store/city/clan and becomes the strongest.
A lot of text will be wasted on introducing new fantasy material and equipment.
Whereas the first few 100 chapters in modern setting there were some female leads who had some character (albleit annoyingly), they will be reduced to a few mentions. Newer female characters are introduced, but have flat personalities but will eventually be just another addition to the harem never to be evolved anymore.
There will be a lot of buildup, where new characters are on an adventure with the MC, but the author will soon abandon their roles in the story.
The author tries to fill up gaps by having the MC going back to the lower plains but the explanation rarely is satisfying and rather forced. Thumbsup for the attempts though.
The final third of the novel has some annoying time skips, where the MC will be injured/training/meditating/captive/on the run/creating stuff for decades and even centuries. I think the record is 1000 years, where he gets freed from an injury. The rest of the world just happens to remain the same for 1000 years. Nothing happens. All this enemies will just wait for 1000 years before they get into fight with MC's friends in order for the MC to come and save the day.
It becomes ridicilous when in the end he visits the lower plains where the author remention forgotten characters and attempts to explain the MC's past (and implicitly explains the novel's title). With al the timeskips, MC would have left earth for thousands of years. But when he goes back to earth, he'd still be able to go back to his own city...
The ending is rushed as the author apparently had some problems with the publisher.
Conclusion: nice try, try again harder next time.
story totally fell apart IMO... everything just happens “as a matter of factly”...
All MC’s teachers never showed up anymore after the first arc. “They’ve died in the war, so now we need to avenge them”.
Sure, everything is mentioned. Including MC’s lost memory, but it’s just like “ping, remembers everything now. Oh well, needs to go to war”.
Same with the “paper bird girl”, “oh, you were the one! Ah well... you surrender or not”.
All who were “important” to the MC, including his pets don’t get a decent backstory. His bird just happens to evolve into a phoenix, but never be seen again. Same with Apple girl, his treasure finding worm, little fire.
Even Pu didn’t get any screen time anymore the last 100 chaps. “He exchange himself for MC and MC saves him. ” And that’s it.
The most laughable thing: the final fight with the most dangerous, final opponent who was introduced since the first arc (early 100 chapters) “just lost”. No strong battle, super moves. Just “I’ve lost”... And worse, he didn’t even lose by the hands of the MC.
The last 300-400 chapters is just about the all-out war. Everyone just become half-god/god with no effort at all it seems...
It started out good, a mysterious and funny MC, a compelling world. Then he needs to gain his power and everything fell apart. The author introduced enormous amounts of characters, fractions and teams with each several nicknames and changes the POV to these characters, fractions and teams.
I have never felt so disappointed with a story... Feeling so unresolved...
Not the best story of TJJS. The side characters never really grow into you. Which is a good thing, because they don't really appear anymore. Even though they are very important for the MC's growth.
MC himself is also emotionally unstable, making a lot of annoying mistakes.
There are three main parallel running arcs, or better said, 3 main goals of the MC. But they all end abruptly. The main arcs and the side stories often ends in a deus ex machina way. In the end I didn't really care anymore for the final battle.
The MC's "mystery" is quite simplistic too, and you'll see it coming miles ago.
Good thing is that the novel's a short read, and while reading, you will keep reading. But if you were to wait for (slow) translations, you'd give this novel up very soon.