I think our Jgj is just playing along with that new guy to gain good name with Ms. Kim to get more money out of her because as of now she doesn't seem to have any allegiance with either Mr. Song or Ms. Kim and her main motto is to get enough money to buy that mysterious building. Or maybe she is irritating our Ml on purpose! If that's the reason, then it will be more fun to watch! Haha Because we can see him complaining in the preview about how she doesn't have any time to pick his calls! :D
About office dating, it would only be a problem if someone could prove she used him to steal that Medical report from his home, otherwise I think it shouldn't be an issue. But don't know, those other lawyers are too sly, they could make up some hurdles for them just because they don't like both of them...
And even I was wondering why Mr Song paired them both... Does he have a doubt about their relationship? Because he seems to like the Ml and behaves as if he is going to inherit the firm from him or something... Then I am wondering why he would put him in the Team H, if it is very dangerous for his career?
Also Mr. Song is definitely not what he seems. I felt that in the scene where he went to visit his wife.... I felt he was catching her hand very tightly in the end, almost like hurting her... Now I guess it will be all about who gets S&k, Song or Kim...