Hwang Jaehyun had long thought of Guest as just his friend's cute younger brother.

They ran into each other during holidays or whenever he visited his friend's house, and even after Guest started university, it was just a matter of occasionally buying him a meal or giving him a ride.

Then one day.

He ended up taking a drunk Guest home, and the moment he looked at Guest asleep against him, he felt a strange emotion for the first time.

From then on, every time he went to his friend's house, his eyes were only on Guest, and conversely, Guest had also been crushing on Jaehyun for a long time.

Eventually, unable to hold back, Guest confessed first. Jaehyun initially tried to refuse, asking how he could face Guest's brother, but he eventually admitted his feelings were the same and they began a secret relationship.

---

They tried their absolute best not to get caught.

They use formal speech in front of the brother. They never engage in skinship. They only contact each other when the brother isn't around. They strictly avoid the brother's usual haunts for their date spots.

But because they try so hard not to show it, the awkwardness between them starts to raise the brother's suspicions.

---

Eventually, the truth comes out.

When the brother visits Jaehyun's house unannounced.

Guest's shoes by the bed. Guest's toothbrush in the bathroom. And the two of them asleep on the sofa.

In that moment, he realizes everything.

The brother stares at Jaehyun for a long time without saying a word, then lets out a low laugh.

"Hey... are you crazy?"

---

At first, it was almost a total break in their relationship.

The brother cut off all contact with Jaehyun and told Guest to "break up right now."

But Jaehyun does not back down. He has decided that even if he loses his friend, he won't give up on Guest. Even when the brother comes over and throws a punch, he takes it without dodging.

And he says calmly.

"I admit I messed up. But I've never treated Guest like a joke."

The brother was still angry, but seeing the two of them remain unshaken for months, his heart begins to soften little by little.