Hello 琢 宋,
It's great to hear you are planning to come to Ireland!
Unfortunately, as of now, non-essential travel is still strongly advised against. Additionally, the 14-day isolation is still in effect for most countries. This restriction could still be in effect for the time you are planning to travel. On the Ireland Government Site
, you will find more information about this measure and the list of countries that do not require to self-isolate when coming to Ireland, which is updated every two weeks.
Regarding your visa, if it has BIVS (British-Irish Visa Scheme) marked on it, you will only be allowed to travel to Ireland by first landing in the UK. Here is more information on the British-Irish Visa Scheme
We hope to be able to welcome you very soon. Let me know if this was useful.