We study 4d type $$ \mathcal{H} $$
H
0 Argyres-Douglas theory in Ī©-background by constructing Liouville irregular state of rank 5/2. The results are compared with generalized Holomorphic anomaly approach, which provides order by order expansion in Ī©-background parameters Ļµ1,2. Another crucial test of our results provides comparison with respect to PainlevĆ© I Ļ-function, which was expected to be hold in self-dual case Ļµ1 = āĻµ2. We also discuss Nekrasov-Shatashvili limit Ļµ1 = 0, accessible either by means of deformed Seiberg-Witten curve, or WKB methods.