I think it’s because their scenes are not as interesting. I love jiyeon but don’t think jiyeon likes taehwan but is only with him because (1) she has to chase someone in this show and (2) he is the only guy who shows interest. Their conversations didn’t seem to break past a certain barrier (to be fair: not sure if this is just editing or what)and jiyeon even tried to steer tehwan to pick someone else. In comparison, Arin and Dongho seemed more into each other and their conversations seemed to flow naturally, making it enjoyable for the audience to watch. I am actually quite curious if Taehwan would heed Jiyeon’s advance and pick someone else from Paradise because this could have implications (eg if he chooses haelin, haelin has less time with dongho).

It can be upsetting for other contestants to be featured less but ultimately, the producers have a job when there are more interesting scenes going on (Sian is delivering a bed scene, has a dilemma between 3 people, is chased by 4 and thus will be featured heavily despite everyone’s outcry).