The Boss Behind the Scenes Is a Dragon

This is a story about alien weapons. His business failed, he was in tens of millions of debts, his wife left, and his brothers made things worse for him. After graduating from college, nothing went well for Yang Yu. Just when he was about to jump off the building, he was accidentally taken back a thousand years ago by the last dragon on earth. Although he saved his life, staying in ancient times without electricity was really worse than death. Yang Yuxin learned that if he wanted to return to modern times, he either had to practice exotic martial arts to the point where he could transform into a god, or he could only obtain the magical talisman "Light Note". Anyway, it is impossible to cultivate, so you can only find the "light notes".