Two martial artists are killed, leaving their wards orphaned. An assassin team is defeated by a master who spares them. He raises the orphans, teaching them martial arts.

Two martial artists are brutally killed by a team of assassins, leaving their wards, a young boy and girl, defenseless. A martial arts master dispatches of the assassins, sparing their lives, and decides to take them in. He raises them and teaches them martial arts.—MyAnimeList

At the end of the Tang Dynasty, the world was in chaos. In the first year of Tianyou, Li Xingyun and his minister Li Huan wandered to Yuzhou City. They ran into the black and white impermanence of Xuanming and killed Lu Ji on the stone bridge outside the city. In the city of Yuzhou, the old and the young met the heroes Lu Youjie and his daughter by chance. Li Xingyun and Lu Linxuan had a conversation. Li Huan knew the identity of Lu Youjie, so he gave birth to the idea of letting Xingyun become a teacher.—Drawing Jianghu YouTube Channel

The story takes place at the end of the Tang Dynasty, when the situation was turbulent, both the dynasty and the people were terrified. All the mysterious organization "bad people" belonging to the official government have lost their traces, and what is also unaccounted for is the priceless treasure of the national treasury. Legend has it that all the secrets are hidden on the Longquan Sword, and those who get the Longquan Sword have the ability to control the world.—WeTV