Longer answer: Il-in is obsessed on dead-looking Muni, got a monster snake to preserve him by draining Muni's blood and feed it to the snake and have him transform into Il-in's ideal Muni, Shaman failed the ritual, and instead made them reincarnate to meet again, Yitae and Giyun doesn't have past memories but are actually attracted to each other, Snake!Muni who got the obsessed side of Muni, unable to recognize Giyun is past Muni, mistaken another twink is Muni and possessed him, now Yitae thinks all the twinks Muni possessed is the one he likes. Snake!Muni made Temu version of Il-in based on his memories. Shit finally happened because it all started when Giyun took a pic of Temu!Il-in and got cursed, got r*ped by Temu!Il-in, but had a lovey-dovey moment with Yitae later on, Shaman also got possessed by Snake!Muni, many stuff happened in between and actual Il-in is now awake in Yitae and the actual Muni with a grudge against Il-in is now awake in Giyun. Awakened Muni (along with other people involved in the ritual) stabbed Il-in and Temu!Il-in is following Giyun.
Tldr: Il-in is obsessed in dead looking Muni, got a snake to be "reborn" as a dead looking Muni, Shaman failed ritual, got them reincarnated. Yitae and Giyun are originally attracted to each other but Snake failed to recognize Giyun is reincarnated Muni, manipulated Yitae to think he's attracted to those twinks he possessed. Shit started to fall apart because Giyun took a pic of Temu!Il-in made by Snake. And now both Il-in, and Muni with the grudge are awaken.
What was the plot of ts again??