I loved this series! Although I can't really recommend it to people who can't stand both degrading art quality and low quality TL for the chapters, but here's my take on this manhwa;
For me the story is very unique in terms of how it approaches the "MC has Niche Interest" and the kingdom building trope, especially how it tries to bridge the gap between the MCs life in reality and in the VR world;
It shows a strongman-looking MC who is not just strong, but looks terrifying considering his size. But that's not the only thing that makes him unique; he also loves flowers! And he sees the VR game as an opportunity to pursue his dream as a florist, and also a way to show to MCs father that he doesn't want to be a fighter(?), as that's what his father wants him to be iirc. And as such, because of his unique interest, in turn the plot also develops into showcasing his interest as a unique skill/opportunity in the VR world, which as we can see from further plot points in the story, makes him stronger and also earns him a ton of money in the real world, which gradually allows him to gain the approval of his father and mother, which have now also developed an interest in the VR Game.
Now, in the Kingdom Building regard, just basing this on from what I can remember since I last read this 4 months ago, what makes it unique is not how the MC is able to gather a lot of subordinates and such because of his unique power and friendly nature which allows him to gain opportunities of friendship, but instead how his unique powers as a florist have a major impact into the creation of his kingdom architecture-wise.
He has the power to provide areas for his people and also has the power to make the environment suitable and catered to their needs.
Hell, that one point in the plot where he created a glowing flower pathway thingy for some NPC otherworld species, actually earned him hella income because a lot of people loved the scenery of the kingdom, and wanted to move into the MCs kingdom.
Other Kingdom Building Series' focus more on the strength of the kingdom, but the unique part in this series is that it's Kingdom Building trope isn't that heavily focused on that, instead, it highlights a lot of things such as interactions between unique characters and the aforementioned architecture highlights all throughout the series.
Overall, it's your typical RPG VR Adventure series with an MC that has a unique interest, but it does have it's good parts in terms of humor and slice of life, so feel free to give it a read! (Although I still believe that you would enjoy this series more if you find another good quality source in terms of TL and Art Quality)
The Strongest Florist