Leaving and coming back to Taiwan

Hello guys, I’m looking to go to South Korea for 2 weeks, and I’m scared I won’t be allowed back in. I have already got a stamp that looks like this noellin.files.wordpress.com/2009 … .jpg?w=300 dated for June 30 not aug 6, because I already went to Italy on March. Do I need another stamp or is this sufficient? I have gotten mixed messages saying that one stamp is good for multiple entries and others saying I need to get a stamp every time I leave and come back to Taiwan.

Thanks guys