The water internal structure is guided by the enhanced hydrogen bond network, and we have quantified it by calculating the scaled hydrogen bond number (𝜒 𝐻𝐵 ). It reveals the substitution of water-water hydrogen bonds substantially by the water-urea hydrogen bonds and to some extent by the water-choline hydrogen and group. However we focused to elucidate the structure of water in the presence of reline with varying concentrations. We strengthen our study by calculating the fraction of water molecules that could effectively accommodate different numbers of hydrogen bonds. We find that while the wt% of water is higher the system is mainly driven by the bi and tri coordinated water molecules, an increase in reline wt%, especially in case of W-UC (8:4) system is driven by the mono coordinated water molecules. Further analyses of the different modes of binding for mono, bi, tri, tetra coordinated water molecules reveal that the successful hydrogen bonds made by water molecules with other water molecules are gradually replaced by urea those enter the coordination sphere of the water molecules. For example, in the case of tetra coordinated water molecules, we find a gradual replacement of the water-bound sites by the urea hydrogen bond sites, as can be seen from the bar plot diagrams. From these aforesaid plots (Fig 10 ) it is evident that owing to the presence of multiple potential hydrogen bonding sites the scenario of water structure recovery in terms of tetrahedrality mainly comes from the urea molecules as it actively penetrates the water coordination sphere whereas the bulky choline molecules do not significantly participate in hydrogen bond formation. This in turn accounts for the interference of urea molecules within the hydrogen-bonded water molecules. Hence it proves the crucial role played by the hydrogen bond network in deciding the overall property of a system. We believe now we have a better understanding of the change in the microscopic picture of water structure in the presence of reline as the latter is varied from low to high concentration.