Late to this but if you still haven't read, basically mc (wooseo) is in love with the ml's younger bro (jiseok) who's his bsf for years but then mc finds out his fated partner is the ml (older brother/jigeon) because of the ring that appears on mc's and ml's finger. Btw fated partners connected through the ring can't sleep w/o eachother
So ml alrdy knows that mc is in love with his younger brother so he insists on mc to use him as a substitute since he looks like his younger brother (basically playing the role of a kind lover) and in exchange mc has to sleep with ml every night (because they can't sleep without each other)
Someone told me: “A link between relationships” (ML kinda becomes substitute for his younger brother for MC with consent.
Explain pls and I don’t mind some spoilers/ not ending spoiler tho
And include their names and who’s ml mc, etc