Samy Marie Uoyevoli I'm not sure, spreading rumors about them would hurt Yukika's reputation as well. I think he would either just hurt Producer Kang in some way or as Meldonator said, maybe kidnap Yukika, or something along those lines.
toumeiNi I don't know in Korea but in Japan an idol only suspected of having an affair can lead to a huge scandal and a graduation or a contract termination... or terrible behavior like when an AKB shaved her head in contrition 😞 Indeed they have materials to spice things up in next episodes!
Meldonator As far as I know, Korean idols also have a no dating rule, so yeah, Yukika would not get out of it without a scandal. I don't think the guy wants to hurt her, even if he's jealous now.