First was a dream of Seju but the last one was a memory, right? So Seju used to call Sumin by "Darling". So It was because of This that Sumin was surprised when Sungji started to call her like this too. Well, well! I hope Sumin don't remenber of Seju every time Sungji calls her. Still team Sungji but I feel pity for Seju, everybody needs to be loved! Wish there was someone else good for her. Too bad! Also, sorry my bad english, it's not my mother-tongue.
Σ( ￣□￣| |) Damn it Chae So-wol! Please be safe Hyewon!