This chapter should satisfy those who were wondering about DG calling Jiwon seonbae. Like DG, Jiwon was also abstaining from alcohol after his alcohol-fueled sex session with DG earlier in the series, so he and DG decide to get together and drink to make better drunk memories. DG gets drunk and cuddly very quickly. Drunk DG asks Jiwon if he can call him hyeong, but Jiwon still associates that word in a romantic context with his scum ex and feelings of rejection, so he says no. Drunk DG gets upset and even asks about Jaejin calling Jiwon hyeong (Jiwon considers Jaejin purely as a dongsaeng, so no romantic context at all to remind him of his ex), and he says that Jiwon doesn't even call him Donggyunie when it's just the two of them. He runs off upset to the bedroom, and Jiwon thinks about it. He even googles it and learns about the importance of titles in a relationship. After thinking about how they first started and where they are now in their relationship, he goes to DG, calls him Donggyun-ah and tells him he can call him hyeong. DG excitedly does so with many variations (hyeong, Jiwon hyeong, Jiwonie hyeong), and Jiwon finds him so cute that he gets hard and kisses DG. I guess after that, they'll start having sex. Also, it appears that Jiwon told DG about the scum ex already, probably during their unspoken conversation, since he was explaining why he didn't want to be called hyeong to DG on the bed.
Chapter 73 Spoilers
This chapter should satisfy those who were wondering about DG calling Jiwon seonbae. Like DG, Jiwon was also abstaining from alcohol after his alcohol-fueled sex session with DG earlier in the series, so he and DG decide to get together and drink to make better drunk memories. DG gets drunk and cuddly very quickly. Drunk DG asks Jiwon if he can call him hyeong, but Jiwon still associates that word in a romantic context with his scum ex and feelings of rejection, so he says no. Drunk DG gets upset and even asks about Jaejin calling Jiwon hyeong (Jiwon considers Jaejin purely as a dongsaeng, so no romantic context at all to remind him of his ex), and he says that Jiwon doesn't even call him Donggyunie when it's just the two of them. He runs off upset to the bedroom, and Jiwon thinks about it. He even googles it and learns about the importance of titles in a relationship. After thinking about how they first started and where they are now in their relationship, he goes to DG, calls him Donggyun-ah and tells him he can call him hyeong. DG excitedly does so with many variations (hyeong, Jiwon hyeong, Jiwonie hyeong), and Jiwon finds him so cute that he gets hard and kisses DG. I guess after that, they'll start having sex. Also, it appears that Jiwon told DG about the scum ex already, probably during their unspoken conversation, since he was explaining why he didn't want to be called hyeong to DG on the bed.