Roommates at first but Lovers in the end?

Sunny and Yuri used to be roommates but now Yoona is with Yuri in one room and Taeyeon is with Sunny in another room. They've grown apart after they weren't roommates anymore and they barely exchange words in the dorm. What happens when they get an opportunity to talk to each other wth just the two of them and nobody else in the living room.Will they start hanging out with each other again just like old times?Or is there going to be another emotion involved?