I love this series, but I really wish this arc would hurry up and finish already. Granted, he finally made some progress in these two chapters, but it's been 2.5 years and 25 chapters since we've seen any of the other characters besides these two.
Edit: I suppose it was only 6 months since the start of the arc in the original publication timeline, but that's still pretty long for a weekly manga/manwha.