Waste Prince: Why do

"His younger brother's daughter I can marry, and other princes can marry her too, but only Ninth Brother is off-limits!",The prince was so shocked that his eyes widened, and he collapsed to the ground, leaking a stream of yellow urine. His face turned pale as he cried out, "Help me!",In summer, one must extinguish the intent to kill of the two guards with the shortest possible words: "Murdering the prince will bring ruin to your nine clans!"。