I have been acquainted with my neighbor oppa, Gu Dojin, for over a decade. However, on that particular day, I was unexpectedly confronted with the sight of his bare chest, which was strikingly impressive. As a person whose ideal is a gentleman possessing an admirable chest, I, Yuju, found myself utterly perplexed. Ultimately, in a drunk state, I committed an irreversible mistake.

"Dojin oppa, may I touch your chest just once?" I inquired, never anticipating the consequences of my actions. I could not have foreseen that my drunk self would behave so impulsively.

"Observe this," he insisted.

"..."

"I said, observe this!" he reiterated.

I observed, and what I saw was unmistakable. I was taken aback to discover the unsightly marks on his chest—marks that were, regrettably, inflicted by my own actions.

"Do you see my swollen nipples? How could they not be swollen? You bit them with such force that when I wore a t-shirt during class, the fabric's friction caused considerable discomfort. I feared it might even bleed," he explained.

"..."

"Yuju, what is to be done now? This is the result."

"...Dojin oppa, I apologize."

"Apologize? Do you believe a mere apology suffices?"

"Then you are free to..."

"..."

"You must experience it as well."