Where to buy perfume in Kaohsiung and online?

Where is the best place to buy perfume in Kaohsiung or online? I’m looking to buy shiseido zen specifically but don’t want to buy a fake version… also interested in more high-end and niche brands like byredo, diptique, Francis Maison kurkdijan etc…Thanks!

Do not buy perfumes online. They are all fake!!

Department stores, first floor is mostly dedicated to all the perfume and make-up stuff.