Everyone Changes Their Profession: I Am a Swordsman, and I Can Destroy Kyushu with One Sword

There are so many professions to choose from, but you want to learn swordsmanship! Li Qingyun traveled through time to a world where alien beasts were rampant and alien races dominated. The human race could only fight against them by changing jobs and upgrading. On the day of job transfer, Li Qingyun awakened the system. But the system asked him to give up the three-star Paladin and instead choose the most unrecognized and useless professional swordsman. The classmate ridiculed: "A toad with such a useless profession still wants to eat swan meat, eat shit!" The school belle is disgusted. "Ding, congratulations to the host for obtaining the S-level skill [Swallow]"