The short version:
Imagine Ready Player One, but Asian, and with the genders inverted.
Okay, there are slightly more differences than that, but if you started off thinking it was Asian heroine version of Ready Player One you wouldn’t be too far off the mark. The time period feels a little more “now” but otherwise it’s a girl saving the world by playing a video game.
It’s fun, quick brain candy to while away an afternoon.