Hungry hungry caterpillar

This little guy was crawling on the side of a tree in Children’s Grand Park in Seoul, South Korea. It may not look like it because of the focus settings, but this is a side view. I tried to focus on the head so the rest of the body was blurry, and after a million shots, I got this one. I think it is just a regular caterpillar, but if anyone knows the exact species, I would be most grateful. Also, is it a butterfly or a moth caterpillar?

Episode #1 Update: For last weeks photo, it was apparently a moth named Composia fidelissima.
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