Similar to permittivity, another phenomenological parameter to set is the quality of solvent, collectively describing effective interactions between the monomeric units as compared to the polymer-solvent interactions. We characterize these interaction using the second virial coefficient, B 2 , where as explained in Sec. S1.1 in the ESI. The value of B 2 is the highest for purely repulsive interaction (athermal solvent) and it gradually decreases towards the θ-state, which is defined by B 2 ≈ 0. Clearly, aditional attraction between the monomeric units further stabilizes the coacervate phase, extending the coexistence region, in agreement with Ref. Moreover, we observe significant decrease in partition coefficient of NaCl as quality of solvent drops, since the phase of the complex is getting more crowded.