newtoki316.com/webtoon/29163712?toon=BL/GL
The seme apparently cut the fate thread/string of the uke when he was a child. He tied his thread together, hence why there is a knot between the two (and maybe why it's two different color?). He used to see ghost not anymore. Now ghosts are avoiding him (kind of), that's why the uke hangs out with him. The uke got more unlucky after the thread stuff, starting with the accident where he got the scar on his face, when he was a child. Apparently, if the seme continues to hang around the uke, he will die (according to his shaman uncle). Oh and of course, the seme is obsessed and possessive with the uke.
Salvation Spirit