
I read the novel very long time ago ..and is stumbled on few mushrooms/ plants Doomsday bl so might got confused...but if remember it correctly, this one ML got a son .. his son actually the little mushroom spore ..so technically the spore belong to the mushroom...so it's his son?...but again I'm not sure..maybe check the novel for spoilers

Spoilers
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Yeah, MC's entire reason for going to the city was because someone took his spore and took it to the city where an ze came from. With An Ze's blessing, MC took his identity and enters the city. Goes on a search for his spore, it was till bery oater one we and the MC find out that it was
HUGE SPOILERS
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it was ML who took the spores. Apparently the spore might have the answer to basically save their world/humans. I think it was in the terms of helping them basically adapt to the planet??? Im not sure. So yeah, that's why he took it, MC took a long time to find it cus it was hidden in the labs n out of reach from regular citizens.
The spore is basically mc's child. Also the ML's cus apparently, it imprinted on him??? I forgot lol. I just remembered the spore acting cute to the ml
so cause this is a bl, the ml falls in love with a mushroom?