American Fan:
I wonder what Shone's part in all this is exactly....
I was thinking about this yes, I guess I do think about Only Boo on my off time lol so I had to come back and add my theory.
So, we know Shone is Moo's cousin, meaning he definitely comes from an Entertainment background. He is also a producer for a travel show. He takes photographs, so he's probably into fine arts. We also know, that Kang's mom likes Shone.
I think there's a misdirection going since the promos, trying to make us think that Shone has romantic interest in Kang, but knowing the relationship between Shone and Moo, I don't think Shone would do that to him. Plus he seems too mature for that. I also do think that Shone knows who Moo's crush is. He asked Moo for a picture, and they just didn't show us when Moo showed him. Of course, they will probably show us Moo getting jealous when he see's Kang and Shone together, but it probably won't be a big deal. This show knows how to solve issues in a timely manner.
Therefore, my theory is that:
a) Shone will influence Kang to continue with his dream of making art and/or studying art
b) Shone will smooth out the road for Kang and Moo, with their mothers, but specially Kang's mother
c) Both A & B
Of course, I'm probably reading too much into this and I'll probably be wrong lmao, but theorizing is fun.