Momoze Hui Guo Rou

A quiet, dutiful prince whose household was gutted before the war began: her trained guards were reassigned to her infant brother Marayam, leaving her watched by strangers with no loyalty to her.

Addendum ch.368Strangled in her quarters while her assigned guard slept — the war's first royal casualty. The killer's identity was shown to the reader only in silhouette; the household investigation went nowhere.