When Lu Mingfei fails to react at all to the 3E test, the professors suspect that he is heir to a powerful legacy... 
I should've been more careful!
!كان يجب أن أكون أكثر حذرًا
Ich hätte vorsichtiger sein sollen.
J’ai manqué de prudence !
Avrei dovuto essere più prudente!
Нужно было действовать осторожнее!