
Everyone the Grandpa they met is the Hundred Year old granpa and they call him "great granpa" and he lives in the mountains I believe.
Now this granpa who's sick is the father of Jinyao's father. I'm not sure though if he's the son or nephew of Jinyao's great granpa. But, definitely, in the future chapters you'll see these two(granpa and great granpa) together.
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Anyway, I'm being silly in that Yiyi x Fengfeng's scene. If I don't know the whole story, I would interpret it in a way they they're having a whole different level of relationship.ლ(´ڡ`ლ)
Well definitely, Yiyi will always be an another dad of Rourou BECAUSE hahahaha he'll be a hubby of Fengfeng in the future(that's all I believe)(๑•ㅂ•)و✧
Just a thought though what if Rourou is really a biological son of both Yiyi and Fengfeng. Like their cell got combined. In chapter 1, Yiyi mentioned that he had a DNA Identification book, not sure if Fengfeng falsified that one too. But just what if truthfully that one says he's the father too?? Just since when Yiyi's frozen sperm was missing. Yeah, it was just confirmed in the series that it's missing but it wasn't mention since when was the last time they checked it that it's there. Lol sorry I being silly here but this is tagged as 'fantasy' so my mind is going off somewhere.
Back to reality, however, what if the missing sperm of Yiyi produced an offspring. The He family seems of a great influence just what if someone traced Yi Yun's connection. Anyway I'm just talking some what ifs here. Sorry will stop for now.

Spoiler..
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Well based from the current raw, Yiyi and grandpa haven't met yet. So just like you, I wonder too how grandpa will react. He seems attached to our Rourou so who knows.. He might thing that Yiyi will be his savior too lol because of that dream.. but yeah I worry about how great grandpa described his son-- being a nosy one to other people's relationship. Grandpa is in good terms with the old He family and seems to want to maintain that disposition. We know how the old He couple longs for Yiyi so yeah grandpa should not hurt our Yiyi or else it's not just Rourou and Fengfeng who'll be on his bad side but the He family. ლ(´ڡ`ლ)

This is basically where everyone's asking for both parties to have a proper communication.
Glad that Dongho didn't bottle up everything to himself not letting more misunderstanding all over the place. And for me, he's right to say just who is to his life. Like, hello?? they had a prior arrangement and Jaehwan was late and made some vague explanations and had the nerve to ask Dongho just why he have explain things to him!! He himself should consider just who he is!! Just what it is he expected from Dongho?
I understand that Jaehwan had no choice. And for me, he did the right thing to help his "past flame" to get home given the situation. I absolutely won't leave someone I know alone and drunk somewhere. What was wrong was that, he neglected to inform his previous engagements while he has the opportunity and not properly explaining things and made them look like they're the one's at fault not him.

Ok so Daiki/Daichi is using Naruse-san's first name "Keiichi".. Idk if it's the same as the raw or the translator only. But the way everybody call the other is sometimes confusing. In Japan, i believe they're on last name basis. If you're close to the other that's where most drop the formalities and call them by their first name.
What if that magical child is the representation of Rourou. And he told to look for Yiyi. Lol I wanna see how Grandpa would react once he met Yi Yun. And who is he in Fengfeng's life
That s what i was thinkingヾ(☆▽☆)
yep! magical child in granpas dream = rourou
sick duck prince in rourou's dream = grandpa