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Let $R$ be a fusion ring and $R_{ℂ}:=R{\otimes }_{\mathbb{Z}}ℂ$ be the corresponding fusion algebra. We first show that the algebra $R_{ℂ}$ has only one left (right, two-sided) cell and the corresponding left (right, two-sided) cell module. Then we prove that, up to isomorphism, $R_{ℂ}$ admits a unique special module, which is 1-dimensional and given by the Frobenius-Perron homomorphism FPdim. Moreover, as an example, we explicitly determine the special module of the interpolated fusion algebra $R\left(\mathrm{PSL}(2,q)\right):=r\left(\mathrm{PSL}(2,q)\right){\otimes }_{\mathbb{Z}}ℂ$ up to isomorphism, where $r\left(\mathrm{PSL}\right(2,q\left)\right)$ is the interpolated...