Siseonui Uimi

During his school days, Seo-Jin developed an interest in Seung-U, who would stare at him with a completely expressionless face. When he starts to perceive Seung-U's gaze toward him, he realized that it was because of him that Seung-U would start to show small glimpses of emotions on his usually blank face. And with this, both of them would start to feel satisfaction when being with each other, which leads Seo-Jin to stay by Seung-Woo's side as his friend.

But one day, when Seung-U starts to become distant toward Seo-Jin, he starts to find himself feeling bothered by his actions and decides to find out the reason behind it...

Note: Includes two extra chapters.