They're sort of weird. They hang out, share the same circle of friends/management, and so forth, but when they work together, they don't come off as sweet. Like Son isn't even trying. He's just standing there and Vill, she doesn't even look at him. Hahah. I don't know. What we see isn't always the truth, though. Costars can have amazing chemistry but they're not even friends behind the scenes and then we have Son and Vill who are friends but can't emote.
I hope the official shots are better than this. If I were the photographer, I would be having them retake. Hahaa.