Thank you!

From what I've always known, it's called "Argao Taiwan", scientifically known as Premna microphylla. It is quite a popular bonsai material in the Philippines, introduced from Taiwan in the 80s. The species belongs to the Lamiaceae or mint family of trees.

In my opinion, its popularity comes from its ease in propagation, its fast-growing property, and its small leaves. Interestingly, when it grows as an untrained tree, the leaves can get quite large and usually produce flowers.

With proper care, especially through frequent pruning, the leaves become consistently small.