Crayoko

"This is so masterpiece" is grammatically incorrect because "masterpiece" is a noun, and it needs a determiner (like "a") to function correctly in the sentence, or the sentence needs to be restructured to use an adjective or verb to describe it [1]. The word "so" typically modifies an adjective or an adverb, not a noun directly in this context.

For example: "This is a masterpiece(which makes no sense because he haven't showed a drawing yet)"