In both episodes 242 and 243, Yura laments that her husband isn’t very affectionate, and I get the feeling that this is something that she talks about regularly on the show. Sometimes it does look like Jong Hyun isn’t as invested into their relationship as Yura, but he does admit that he needs to try a little harder. He even tries to give Yura an awkward side hug when they have to say good bye.
The quiet type may not be the most entertaining on a variety show, but there is charm to him. I know Yura wants him to be more affectionate (and he most likely will right before the end of their relationship) but I kind of like that he plays the straight man in their relationship. He just needs to get more comfortable being in a virtual marriage, and that comes with time.