Roth's Theorem in Super Smooth Numbers

We say that the set of $y$-smooth numbers $\mathcal{S}(N,y)$ up to $N$ is super smooth if $y={\log }^{K}N$ for a large fixed constant $K$. We show that the Roth’s theorem on arithmetic progressions is true in super smooth numbers case. This extends the result of Harper where he showed the statement is true under a weaker hypothesis.