WHAT DOES IT MEAN SIWON WHAT??? AHHH HI KJJHBYYGTRDTRRTFYFGUHBU DX

It means that the envy stone only works if the holder of that stone is jealous... sooooo Jinha is trying to convince Xuan that he loves him so he can't use the envy stone.
And then Jinha and Siwon can meet up in their dreams without Xuan.
Could also be possible that Jinha wants to get close to Xuan to steal the envy stone and then they'll be free in their dreams :D
(I can't say for sure tho) ╮(￣▽￣)╭

OHHHH XD WELL I HOPE THAT HES PRETENDING ALL THIS SHIT FOR HIS SAKE XD