I have known my neighbor oppa, Gu Dojin, for more than ten years. However, on that specific day, I was unexpectedly faced with the sight of his bare chest, which was remarkably impressive. As someone whose ideal is a gentleman with a commendable chest, I, Yuju, found myself completely bewildered. Ultimately, while inebriated, I made an irreversible mistake. "Dojin oppa, may I touch your chest just once?" I asked, never expecting the ramifications of my actions. I could not have predicted that my drunken self would act so rashly. "Observe this," he insisted. "..." "I said, observe this!" he emphasized again. I looked, and what I saw was undeniable. I was shocked to find the unsightly marks on his chest—marks that were, unfortunately, caused by my own actions. "Do you see my swollen nipples? How could they not be swollen? You bit them so hard that when I wore a t-shirt in class, the fabric's friction caused me significant discomfort. I was worried it might even bleed," he clarified. "..." "Yuju, what shall we do now? This is the result." "...Dojin oppa, I’m sorry." "Sorry? Do you think a simple apology is enough?" "Then you are free to..." "..." "You must experience it as well."