
No, the jellyfish they were talking about was Mitsuki. Mitsuki appeared in his mother and uncle's dream saying they should follow what their hearts desired, his uncle followed what Mitsuki suggested and had a lover which he gave up everything for. Now, his mother blames the jellyfish(mitsuki) because he was the one who suggested to follow his heart.
And now I'm confused on what exactly happened to his uncle, in early chapters they said that the uncle died of overwork for his lover and the said lover left him. Now in the last chapter, he saw a picture of his uncle with a happy family. This is what I was asking about, did the uncle really died? Then what is that picture he saw? Maybe his grandfather just hid his uncle's family because they are being pressured by the values of their family.
Im confused, so what exactly happened to his uncle? He looked happy in the picture, did he really died?