ˋˊㄈㄢˇㄍㄨˋyìwúfǎngù

义无反顾
  1. 為了道義勇往直前回頭退縮 奮勇義無反顧」。

honor does not allow one to glance back (idiom)​; duty-bound not to turn back, no surrender, to pursue justice with no second thoughts
(expr. idiom.)​ l'honneur ne permet pas de regarder en arrière