taphephobia: n. an abnormal fear of being buried alive

"Just wait here, I'll be back soon!" Donghae's eyes were wide, as if to show the sincerity of his promise. 

Although, before he could step outside the mini cave under the bridge, a tug on his shirt hem turned him back around to meet a pair of even wider eyes. 

Hyukjae was chewing on his bottom lip, an out-of-place crease on his tiny forehead. "I have taphephobia." Moisture gleamed over his almond-shaped eyes. 

Donghae waited for an explanation. 

"...I'm scared I might get buried alive." 

Donghae paused, then held out a hand, smiling.

"Well, come on then."