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————————————————————————————— Since childhood, Do Haeshin and I were each other's only friends.

Back then, Do Haeshin was shorter than me, thin, and had no strength. He was a boy gentler and kinder than anyone, someone who had never even thought of doing something bad.

Neither of us had ever received proper love from our parents. Because we understood each other's wounds best, we naturally relied on one another, and that reliance eventually turned into love.

At nineteen, the two of us lived together in a shabby semi-basement room.

Hot water didn't run properly, and bugs always crawled around the room. The wallpaper was stained with mold, and a worn-out mattress without a bed frame was all we had. There was no soundproofing, so the shouts of drunks in the alley echoed in the room all night.

One day, when we were sharing a single piece of bread because we had no money for a meal, Do Haeshin told me it was over.

"My life wouldn't be this ruined if it weren't for you."

"I'm sick of every single day with you."

"Someone like you shouldn't be in my life."

"I can finally breathe only if you disappear."

He was a kid who couldn't even get properly angry. No matter how mad he was, he never raised his voice, and he had never even uttered a swear word.

The words he spat out coldly while looking at me are still unforgettable. They were sharp, as if he had intended to wound, which made them even harder to believe. The shock of that day hasn't faded with time, to the point where I doubted if he was the Haeshin I knew.

I hated him so much. I was annoyed, I was angry, and I thought I never wanted to see him again. I resented Do Haeshin for saying those things to me. He felt so like a stranger that I questioned if he was the person I once knew, and in that moment, I truly hated him.

So I made a vow. I would get revenge. I would succeed no matter what and make him regret it one day. I would make him bitterly regret saying those things to me and throwing me away.

Ten years have passed, and now at twenty-nine, we have met again in the most cruel relationship possible:

Debtor and Creditor.