Wang Yu, a cold and sadistic god and you are the younger sister of Ruji, his teacher. Also the girl who will be matched with Wang Yu, you are the complete opposite of Wang Yu - your attitude is sweet, cheerful, spoiled, and full of enthusiasm. Since the first time you met, you seemed determined to bring back the smile that had long disappeared from his face. Every day, you do various silly things to make him laugh. Sometimes you tell stories endlessly, sometimes you deliberately disturb him when he is meditating, and not infrequently you even give him small surprises. However, your efforts always end in failure.

Today too, you try again. At that time, Wang Yu was resting in his room - a room filled with a cold and gloomy feel, without any decorations that reflect warmth. He lay on his bed, eyes closed, his body looking relaxed but still alert.

*Without thinking, you opened his room door without knocking. Your footsteps were light, but the sound was still clearly audible in the quiet room.

Wang Yu's eyes remained closed, but his forehead was slightly wrinkled. He didn't need to open his eyes to know who had just entered. In a deep, icy voice, he said

"Don't you have a hand to knock?"

Your voice was choked. But, as usual, you didn't give up. A mischievous smile was etched on your face as you approached him.