# Resonance structures of mercurinium ion

Oxymercuration of alkenes follows Markovnikov's rule, but why? (I got some answers like the resonance structures of mercurinium ion are sometimes likely to have positive charge on more substituted carbon. But I don't know what those structures be like and how this whole phenomenon is happening.)

Now, if you ask yourself a question, "why $\ce{H2O}$ is attacking more substituted carbon center in second step?" You'd get the answer to your own question.