There, leaning hard against the tough wall by the doorway was a guy about their age, face looking rather resigned and discontented.

Gui Gui and Xiao Xun appeared overly startled. Their eyes widened in further shock upon observing that he has a broken and detached doorknob in one of his hands, while the other, clenched and seeming to be about to hit the wall with it any second. He grimaced.

The two girls stepped back and kept a considerable distance, though he was like not bothered at all or displayed slight awareness of their presence. He didn't give a look in the least. They then checked to see their door was still intact.

Gui Gui nudged Xiao Xun. When she did not stir, the girl resorted to pull on her sleeves, causing the frozen girl to scream hysterically until Gui Gui slapped her palm against her mouth to cover it.

The guy finally turned to their direction. The other two responded with defensive glares and put on their guard.

His unemotional expression hard to fully describe, but with stone-cold eyes, he simply walked past them to the other side.

Whispering with utmost caution, Gui Gui asked Xiao Xun, "You sure he's not a night burglar?"

The once intimidated girl squinted her eyes to make out what exactly was going on. She then replied, "I...want to call 911..." She prepared to hurry into their apartment to get the phone.

Gui Gui could not believe what she just heard and grabbed her friend before she entered back inside. "Wait, think twice, will you?" She warned her in unduly concern.

Having overheard them, the guy merely gave them a hostile yet mindful look before moving open further the door to the apartment directly facing theirs.

They locked gaze for a fleeting brief second or two, before Gui Gui's eyes trailed across to an inconspicuous, pitch dark knapsack lying on the floor at a corner.

After pacing in, the guy ended up coughing uncontrollably. She entertained the thought of walking up to him to get an explanation but Xiao Xun's frustrated grumbles distracted her.

He gave in after a while and paced out of the apartment again in surrender. Picking up his hefty bag, he uttered a question at long last, "Where's the stairs to the rooftop?"

This time, Gui Gui was able to behold his appearance with the best clarity in the bright and has the sharply-distinctive features of his face registered deeply in her mind. She pointed to back of the hallway. He then proceeded on as directed without a word of thanks.