A boy named Hoseok had the most beautiful smile in the world. He was literally shining. 

what if he went blind? Will his smile remain? 

.  .  . 

Yoongi meets the most loudest and cheerful person in the world. Yoongi wants to show Hoseok the world one last time before his vision completely disappears. 

"Thank you." 
"For what?" 
"For showing me the world." 
"World? Hoseok, we haven't even walked out of the house yet, what are you on about?" 
"You're my world Yoongi."