Sian and Junseo's second date wasn't as great as their first, but I don't think it was completely bad either. At night when they had that talk with each other, I think that actually made their relationship much closer. Also, the fact that she is still leaning towards him compared to Theo most definitely means that she is willing to accept those sides of Junseo, or at least just change him little by little. Relationships are like that, you have happy times and then you have debatable times, but if you still choose each other in the end, then all was worth it I guess. I think that the second date was actually good for them cause they finalized their feelings for each other. At least for Junseo. The editing makes it look like Sian is still wavering but she will most likely choose him in the end.
I do agree that the show doesn't show enough of the other contestants. Like what is Jiyeon going to do with Tehwan? WHat is Youjin going to do now that she basically don't have any time left to get to know Dong ho? Will Dong ho actually get swayed? (I doubt it honestly) And why aren't there more scenes of Hyejin and Janghoon? This dude came to inferno at such a terrible time. I honestly completely forgot that he even existed for a moment and the editing crew don't even try to show that he exists.