From my understanding and others, this is just a rumor. At this moment it's not confirmed that anyone owns the Dew Kiss Flower itself - but a replica of a flower that looks exactly like the Dew Kiss Flower as it has the same sprite! This flower is called a White Flower. In which it is obtained during, "What a Foolish Quest - Mission 1"....
Mission 1 - First Mission
When Bozo tells you to cut a
White Flower from the
White Flower Temple (
here), head to the south gate of Thais. From there, keep heading south until you reach a river. Then, go around the river and head further south until you see the small building. Cut one of the flowers there. When you try to cut a wrong flower, the following message appears:
This flower is too pathetic. When you cut the correct flower the following message appears: The stubborn flower has ruined your knife but at least you got it.
You see a white flower. It weighs 0.10 oz.
https://tibia.fandom.com/wiki/White_Flower
https://tibia.fandom.com/wiki/What_a_Foolish_Quest/Spoiler#Mission_1
Rumored to be from a floor reset in Oramond, however not confirmed. I did leave a comment asking to clarify the item in question.
https://www.tibiaqa.com/2178/what-items-can-be-found-after-a-world-reset
Tibian Thread here also discussing if this item is possible to obtain, commentors also wrote it is from the first missions of "What a Foolish Quest"
https://www.tibia.com/forum/?action=thread&threadid=4756208