Infinite Transmigration: I Am the Dragon

When a loner transmigrates to another world and becomes a dragon, and when a useless human turns into a mighty dragon determined to control dimensional space, dazzling moments are about to unfold!

(The early story is silly and lighthearted, so you can read it without thinking too hard. Later on, it focuses on protecting and conquering the world, as well as outwitting a hero who has a System.)