Gumi revenge anon here, sorry for my eng...
it wasnt something big, more like gj having his memories and searching for gm but gm doing everything to avoid him, who knows maybe he sleeps with gt so gj also lose the friend he choose over gm in their past life, gm marrying someone else and letting gj see it, maybe his husband dies in a weird way, and gm becomes this pretty widower...
Gm thinks some part of skn evilness remain inside him bc he enjoys seeing gj anguish face everytime they cross their paths