How do I align second row of wrapped cards to the first row with Flexbox?

Question

I am using flexbox, flex-wrap: wrap.

How do I align second row of wrapped cards to the first row?

This is the current behavior:

I would like to have the second row of cards top 'connect' to first rows bottom.

The only alternate solution I found was putting it in flex-direction:column, but I don't want the cards extending horizontally (there can be unlimited amount of cards).

Thanks in advance!