This is a character from a Korean story called "Killing Stalking"

You can read this on Lezhin I believe. 20/10 recommend you read it.

He's not done yet. I was thinking of like, adding blood splatters and maybe the lyrics of a really dark song all around him. Though, in all honesty, I don't know what I want to do to finish this product.

This is sangwoo, btw:

Kid next to him is Yoonbum.

The story is called Killing Stalking for a good reason.

SPOILER OF SORTS I GUESS:
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Killer: Sangwoo
Stalker: Yoonbum

Read to find out more.