First, I would blog about it :). This is a gem, and I don't mean it in a derogatory way, it really is a beautiful case.
And in more practical terms - benchmarking. Look at other chinese websites, see how they solve this issue. I know that chinese elevators say 1-2-3-3A-5, or alternatively 1-2-3-5-6. This is not a solution in this case, since your problem is not with the numbering, but it shows that this is a very common problem and it must've been addressed somewhere.
Five sections is not too much, but if you feel that the extra section is unjustified, you can try combining Projects and Home, or About and Contact (which probably makes more sense). I'm talking about combining the content of the two pages, not adding another level of hierarchy, which would add unnecessary complexity.
Another solution - make the Contact title an icon, so it doesn't seem to be of the same kind as the first three items. Or come up with another visual differentiation, making it 3+1 and not 4. Maybe just separate it - if it's a horizontal navigation bar and the first three are on the left, move the Contact to the right, or some other grouping trick. If it's a vertical menu, maybe a divider will be enough.