In recent centuries, attention has been paid to biological systems to understand their mechanism, as well as iiring them to advance our technologies. The auditory system is one of those biological systems that has attracted the attention of many researchers due to its surprisingly high sensitivity. In the past century, better understanding on the subject has been achieved thanks to the empirical and theoretical works performed on the hearing sensitivity mechanism. Despite the various suggested mechanisms that are able to explain auditory sensitivity to some extent, the attitude of quantum mechanics is the most challenging and yet interesting idea that has been put forth to explain the mechanism. Micro-scale features and high working temperatures in the inner ear are factors that make it difficult to welcome the quantum attitudes. However, the results of a theoretical study prove the role of quantum mechanical effects in the auditory system and explain its high sensitivity. Accordingly, here we propose a full-quantum mechanical model to study the aspect. Our method relies on the quantum Langevin approach and quantum entanglement. In the first step, by applying our model, the sensitivity of the system and its direct relation with the quantum entanglement are qualitatively confirmed. This is an acknowledgment that is a motive for the model to be developed in such a way as to elaborate on the real system.