I thought she knew all these stuff because she had to due to her sister. Like the flowers, for example, she knew because her sister wanted them.
And she seems like a genius because some knowledge that are common in our place, is not common in their medieval-ish era (like the comics and the blackout curtains).
A lot of her knowledge also comes from her being overworked in this life too.
That’s exactly why it still feels unrealistic. She transmigrated only three months ago and during that entire time she wasn’t resting, studying or adapting.
She was starved, overworked and mentally exhausted.
Under those conditions even a modern office worker wouldn’t suddenly gain a deep understanding of a completely new world’s systems whether it’s culture, politics, economy, etiquette or anything else the plot throws at her. And saying she read the original story doesn’t help since knowing a few plot points isn’t the same as having real institutional knowledge.
I get that the story wants to show her as capable but it still expects her to adjust unrealistically fast. Three months of constant stress and exhaustion isn’t enough time for anyone to become that knowledgeable. Those examples just make it seem like the story is conveniently arranging things so the FL always has the exact knowledge required.
Blackout curtains are fine but with the way this story is going I feel like the FL is going to invent insulin at some point because of course "she’s from the 21st century!!!1!!"
Oh yes because an overworked South Korean office worker reincarnating somehow makes her the smartest person in the entire story. Totally believable that she instantly knows how to manage a whole Western-esque historical country. And her inbred Dr. Stone-style, childlike “cutie patootie” character design? Lovely. Plus it never gets old being reminded every other chapter about what a genius she is while she behaves naïve and oblivious and wins over the cold duke with kindness and childlike wonder alone. Amazing, incredible, never been done before. Kudos