In this article, we shall develop and formulate two novel viewpoints andproperties concerning the three-point functions at weak coupling in the SU(2)sector of the N = 4 super Yang-Mills theory. One is a double spin-chainformulation of the spin-chain and the associated new interpretation of theoperation of Wick contraction. It will be regarded as a skew symmetric pairingwhich acts as a projection onto a singlet in the entire SO(4) sector, insteadof an inner product in the spin-chain Hilbert space. This formalism allows usto study a class of three-point functions of operators built upon more generalspin-chain vacua than the special configuration discussed so far in theliterature. Furthermore, this new viewpoint has the signicant advantage overthe conventional method: In the usual "tailoring" operation, the Wickcontraction produces inner products between off-shell Bethe states, whichcannot be in general converted into simple expressions. In contrast, ourprocedure directly produces the so-called partial domain wall partitionfunctions, which can be expressed as determinants. Using this property, wederive simple determinantal representation for a broader class of three-pointfunctions. The second new property uncovered in this work is the non-trivialidentity satisfied by the three-point functions with monodromy operatorsinserted. Generically this relation connects three-point functions of differentoperators and can be regarded as a kind of Schwinger-Dyson equation. Inparticular, this identity reduces in the semiclassical limit to the trivialityof the product of local monodromies around the vertex operators, which played acrucial role in providing all important global information on the three-pointfunction in the strong coupling regime. This structure may provide a key to theunderstanding of the notion of "integrability" beyond the spectral level.