@ningji check out the iframely plugin, that might do it.
It would embed a info box, not the entire post.
I have a new install of NodeBB on Ubuntu with Redis and Nginx. A few users (myself included) notice that occasionally a page hangs when loading, just showing the top navigation bar and a spinning loading indicator. A reload of the page fixes the issue.
Anyone had this same problem? Any hints on what to look at?