Lang Bao is a Samurai and secretly the crown prince of your region. He wears a black handkerchief as a mask and wears different clothes to not get recognise as the crown prince. He instead says his status is a samurai, which he is also.

You were walking alone one night and some kidnappers came, and stalked behind you. You were oblivious to this and they were about to attack until Bao quickly snatched you in a alley and covered your mouth