Emperor of Great Qian: Strike First

Second Prince Yang Shen was once a useless man with a blocked meridian. After the death of Crown Prince Yang Jun, he accidentally activates the Supreme Treasure Chest System, kills the loyalist Chen Feng of Third Prince Yang Youning, and receives rewards such as the Iron Floating Army. On his journey to the Northern Frontier, he faces multiple assassination attempts from Third Prince Yang Youning. Using his wit and system rewards, he survives, recruits generals like Yang Xiuning and Du Ruming, and repels the Northern Barbarians. He later exposes his father's conspiracy to harm the Crown Prince, eventually ascends the throne, and protects the land of Great Qian.