V22 is the class of prime Fano threefolds of genus twelve which was discovered by Iskovskikh and studied by Mukai and many others. Despite remarkable progress on the theory of K-stability, we still do not know the K-stability of smooth V22 and their K-moduli space. In this talk, I'll explain that the K-moduli of V22 in codimension 1 parameterizes V22 with at most one nodal singularity. The proof is a combination of deformation theory, K3 surfaces, and K-stability techniques. Based on joint work with Anne-Sophie Kaloghiros, Andrea Petracci, and Junyan Zhao.