[BL] Due to a rare condition, Vince’s end of the red string of fate is tied around his neck, while his soulmate's, Jack, is tied around his finger, like it’s supposed to be.

Theory says that if they "sleep" with someone that isn’t their soulmate, the string tightens on the other end, letting your soulmate know exactly what you are doing.
When Jack feels his string tightening, he feels heartbroken, and starts to sleep around with everybody as revenge, not knowing Vince was a victim of abuse.

When they finally meet, Vince is already suffocating.

or -
Love and fate's hopes for humanity were way too high and all they got was disappointment

Singularity: The Red String Around Your Neck

They can hear Mrs. Taylor’s loud cry echoing through the halls. 


They run towards it and find her in a room full of doctors and nurses moving around frantically around a bed. 


They see Vince on the bed, he's in what seems to be the middle of a respiratory failure, two doctors trying to put him on oxygen fast enough as he chokes on air. 


Jack feels like he's watching everything in slow motion. 


Why is this happening? Why in the same night he left him alone and screwed up again? It's not fair. 


“It’s not working.” One of the doctors says. 


Immediately, Jack feels his smallest finger burning. He freezes on the spot. 


He knows what this means. He remembers Mrs. Taylor's burnt finger. 


He looks up at Vince again. The doctors try to keep him on oxygen but his coughs are too violent. He gasps for air. 


Suddenly, something clicks in Jack’s his mind. 


Chapter XVII