Adding to seojihan reply,
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Yes flamey is a live plant we see on the fire. FLAMEY originated from the apple sejun took with him when he first entered the tower. I think most people will already forgot about it lmao. She became super op because after planting the seed, sejun forgot about it and accidentally just place his campfire above flamey. I forgot the details but she managed to absorb the flame and the underground power water or stuff. Not sure.
Unfortunately sejun don't actually interacted with flamey as much as he could in the novel, but just know that she's a cute baby.
I paused at chapter 240 something to read other stuff while the translation have gone to 300+.
https://www.novelupdates.com/series/solo-farming-in-the-tower/
FLAMEY? IS THAT FLAMEY? WILL WE GET FLAMEY NEXT CHAPTER? YAY FOR OUR LITTLE SISTER FLAMEY!