As one who hasn't watched this series yet I have to ask.
Is there actually something between these two in the series that has sparked off the fanarts or is it just that they look so cute together?
I've only watched a bit (the first three episodes) but these two are distinct from the rest of the cast as being the only ones with previous experience as idol singers before the events of the story, and they're also the last two to get on board with Franchouchou, largely because of that experience (a combination of being more cynical of Franchouchou's chances as a result of having been around the block once before, and having a harder time adjusting to the changes in the industry since their careers as opposed to everyone else for whom all of this is new so they have no pre-established expectations).