The Most Useless Dude in Daliang Is Actually the Strongest Prince

His family background is the most noble in Daliang, his father is the Duke of Zhenguo, and he has 300,000 frontier troops. Does the only son still need to work hard? Everyone laughs at me for being uneducated and incompetent in literature and martial arts. I only know how to hang out in romantic places, and I am the most useless dandy in Daliang. I didn't expect that how loud the taunts were and how painful it would be to be slapped in the face.