Amber Chen‘s Chinese-inspired YA fantasy (the first in a duology) has interesting world-building and I liked the focus on engineering. However the pacing is inconsistent (especially in the final quarter), the plot relies heavily on things happening to Ying rather than her agency and her romance with Ye-yang is unconvincing, in part because Ye-yang is under-drawn as a character. That said, the ending is interesting and I would read the sequel.