A self-made card showing flowers (maybe Bauhinia xblakeana) and three palm trunks. Thanks Negr.
A vertical stripe of two different NT$5 stamps on president were used. They were handstamped at Shilin (士林) on 4.8.2017.
Apparently, a machine cancel from Shilin (士林) failed to cancel the stamps at first attempt and a handstamp was applied later.