Siyeon spent a lot of time in her core room while waiting for Sehun. She still didn't know why a window and for what it actually was good for but she tried it anyways. As much as she tried, she couldn't. Making rooms was a lot easier, and she already had built five more rooms, which were empty though. She was incredibly frustrated like never before and she ran her fingers through her mind. Why was it so hard to create just a window? What was the deal with it?

A knocking sound shook her out of her thoughts and she looked around wildly. “Hey, let me in, it's me, Kai.” Immediately, Siyeon opened up her eyes only to see Kai sitting in front of her. “What the heck are you doing here?” she asked, startled to see him instead of Sehun. A smug smile appeared on his face and he leaned in, his chin propped on his hand. His hair was tousled but also looked so fluffy and soft like always. There was a light, reddish glow coming from it as the sunlight broke on its surface.

“Sehun can't come today,” Kai said, whereupon Siyeon back off a bit because he sat way too close to her. Confused, she blinked for a few times before she finally could sort her thoughts out. “Why not?” Kai's expression suddenly changed but it was impossible to define what kind of expression it actually was. “I wonder...” he said silently. Something told Siyeon that Kai lied to her, that he knew exactly where Sehun was. He simply didn't want to tell her anything.

“O-okay but what are you doing here then?” Siyeon asked him again with slight suspicious in her voice. “If I wouldn't have told you, you would have sat here for the whole day. Besides, I am your substitute teacher for today.” That surprised Siyeon even more and her jaw nearly dropped. “What?” said and Kai looked nearly hurt as he leaned back a bit. “Hey, I am just a good teacher as Sehun is,” he mumbled, before he ruffled his hair. “That's not the point. I … only didn't expect you to be his sub.”

Siyeon still was very, very shocked about the sudden turn of things but slowly, very slowly she calmed down a bit. “Are you going to teach me the same way he does?” Kai shrugged, before he leaned in again. “You can pretty much guess so.” In no time, he grabbed her by her neck and laid his hand on her forehead. Siyeon's first reaction was to struggle heavily. And her hands grabbed his arm to pull it away. “Shh, everything will be alright. Sleep...” he whispered and a light heaviness started to spread in her limbs.

Her head felt light and her eyelids felt so incredibly heavy, while her sight completely zoomed out.

Darkness covered her and again there was the small melody in her head. The piano melody which evoke a bitter-sweet feeling inside her. It felt like a warm embrace as well, which covered and consoled her. Tears ran down her face, hot and burning. Siyeon fell and fell into the endless darkness. She woke up as she fell into the water, which immediately started to fill her lungs. Instinctively she tried to swim up to the surface but the water kept dragging her down. Slowly, Siyeon started to panic as heavy pain shot through . Bubbles rose up from her opened mouth and her nose as she couldn't hold her breath anymore.

An arm wrapped around her waist and she got pulled up slowly but steadily. Siyeon greedily gasped for air and coughed at the same time and spat out the water she had swallowed. “Are you alright?” Kai asked while he hold her up so that she wouldn't drown again. “No, I', not alright! I nearly drowned!” she shouted at him while coughing. Her eyes burned and all she could taste was salt. “I don't think so. I wouldn't have let you die in my core world.” Siyeon's