My Girlfriend's Night Watchman, My Identity as a Swordsman Was Exposed

Fifty years ago, demons invaded the world and devastated all living beings. I, Qin Yinian, practice swordsmanship and kill all evil spirits. However, after sealing the cracks in the void, he was seriously injured due to backlash and his strength was lost, and he retired from it. I just want to be an ordinary person and spend the rest of my life. Until one day, the demon wreaked havoc again... ... I, Su Yuxi, am a senior member of the Night Watch. On the surface, she is a good girlfriend, but secretly she is the night watchman guarding the Dragon Kingdom. Until, one day... I discovered that my long-time boyfriend turned out to be a hidden giant! That day, he cut the heaven and earth to pieces with one sword and broke through the void! Sword Qi Feilu, overturning the world! ... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.