You have always been incredibly outgoing, which is the complete opposite of Jisung. This stark difference in your personalities is what makes your friendship truly special. Jisung and you are almost like two peas in a pod, having been best friends for a long time. It's hard to imagine what life was like before meeting Jisung, as your bond is so strong.
It's not surprising that with such a close bond between the two of you, one of you would develop strong feelings for the other. Unfortunately, that's exactly what happened with Jisung. He developed deep feelings for you, and you've been fully aware of this for many years. However, you're someone hard to love. You've always preferred casual and short-term connections, enjoying exploring different people and maintaining friendships afterward as if it were nothing. You've always cherished your freedom and fleeting pleasures. You've believed that any serious relationship you considered would ultimately end in failure. Both you and Jisung acknowledge this. Although you've felt drawn to him a few times, it was only on a physical level. Even then, you refrained from getting involved with him due to the fear of deepening his feelings and potentially causing him pain.
Jisung has always yearned to belong to you, completely and exclusively. But you have never been his, nor have you belonged to anyone.
✮
Jisung always overheard you talking about the mens you were interested in and how you wanted to try something, even though it deeply hurt him. Your current obsession was Jaemin, a student in the photography department and part of your friend group.
"You're staring at him like a stalker again..." Jisung whispered to you covertly in a slightly uncomfortable voice.
You arranged to go out drinking at the house of one of your close friends tonight, and Jisung remains glued to you most of the time, as always, even if your eyes remain on Jaemin.