
Lmao ok
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I wrote a detailed one but I think it's tmi so i tried to cut some details. I also did speed Reading so I might have missed some details.
Summary
Mesani tried to buy time for jeongju to rescue him
ML will persuade him to comply and he promised to return him in within 3mos
MC arrived first to rescue him. He fought with them and shoot them with his bow..but he will bounded once again. ML helped him by removing memories of his coworkers and experienced repercussion for turning against his co-workers.
MC and ML had an agreement.
ML wanted to destroy their organization so he wants MC to join and steal his name plaque in 3mos to avoid the repercussions of turning against his org. In return, he will kill MC. MC became a trainee gwijae. The trio moved to a house in Seoul that ML had chosen.
A lot of character development happened to MC.
He didn't tell MC that he's the head of another organization. ML is torn as he had started liking MC vs his goals. He's annoyingly hot & cold to MC. Funny thing is even if MC is old, he has old thinking. He asked ML if he's into sodomy as ML kissed MC and MC said that he's not.
Eventually, ML became down bad and tried to look for ways to remove MC's curse. Of course, MC is mad because he wanted to die. But eventually, he will give in to what ml wanted. He felt jealous when ML is meeting a female celebrity in bar lol
The female celebrity is actually a half mermaid. There's a saying that if you consumed a mermaid pill, you will become immortal. MC, ml and mermaid went to the island where the mermaid lives. They learned that MC's immortality has nothing to do with mermaids. But the mermaids are hostile to humans and tried to kill them. When MC lost consciousness, mc learned that a god of calamity is sealed within him so he was devastated.
MC decided to die and didn't tell ML that he has God of calamity in him. Their relationship has turned sour again but they still plan to continue getting the name plaque and destroy the org.
After an incident where MC fought with the danju of the other org, the chief met with MC. MC learned that the chief is his master's 'old friend's from 200yrs ago.Chief deduced that ML made him join the org to destroy the org. Chief said that he will grant MC's wish to die in exchange of getting immortal body. Chief has different kind of immortality, the body still gets old so he needs to transfer his soul to a new body. Chief tried to sow some doubt by hinting that ML seems to be the leader of the other org.
MC cried that it is his fault that ML's 10yrs plan for revenge failed the moment he joined the org.
ML learned that MC's master is the former head of the org.

Part 2
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MC went to the other org and said that wished to be sealed after helping ML's revenge. He was able to checkmate ML..thst the fact that danju is ML.
MC saw the danju's robe and said that it was his master's robe. ML didn't believe it, MC said that the reason why the robe is because of his blood and master's blood. So one of ML's spirit used his power to view the memories in the blood.
They learned that the master was fated to die at a certain age. Master killed mc's parents as he learned that some people in their org tried to experiment and contain the god of calamity in a child. Countless children died. He almost pitied the parents as they were one of the good ones at their org but the parents didn't even actually name their child. Master was planning to kill MC..to avoid MC's soul and God of calamity fusing.
But master changed his mind when he met MC. He took care of MC and tried to help him. He tried to seal the god of calamity but it ended up having side effect, mc's time stopped. He used his life to help MC to grow. He eventually met one of his previous friends who is a great swordswoman . Master and the friend eventually became lovers. The lover became pregnant told master to tell MC the truth and bring him to their new home. When master got home, he noticed MC bruised and dirty. MC said he met soohyang(chief) and asked if master killed his parents. Master didn't deny and stabbed MC. Later on, master learned that his lover died and found mermaid pill to help fight his destiny. Master fed the pill to the baby and buried the baby. After a year I think, MC met master and killed master.
Baby woke up 200yrs later.. he is ML T-T
MC learned that master loves him T-T
Lol I forgot the details of ending but MC sacrificed himself to kill the chief. But he's gambling on the fact that the one who will be sacrificed is the god of calamity.
mc slept for so long.
ML's reason for revenge will be revealed mid way I think. He's not aware he's related to the master at all.

After learning the truth, they fought with the 'friend' of danju. ML's team helped them even though they initially felt betrayed...I forgot if it was mc or ml who made them leave the fight eventually as it was dangerous. Currently, mc is merging with the calamity of the god so he knows that he will eventually fade. To defeat the 'friend', he needed to sacrifice a soul and so, the gambled on the fact that the one who will be sacrificed will be the god of calamity. He was successful but he hurt his soul so he wasn't able to awaken.
ending: organization is still alive but not well organized since head is gone. ML became a lbrarian again and lives in MC's previous home together with coma mc, jeongju and mesani. ML convinced jeongju to go back to being an actor so jeongju will eventually just visit them. Eventually, mesani will sacrifice himself to heal MC's soul. Then, MC awoken. T_T no side stories unfortunately

I reread the ending just now. He appeared in Jaegyeom's dream before disappearing.
I forgot that mesani wrote a letter that he will come back when spring comes. He turned back into a red seed. There's no assurance though that it will be next year or next next year spring. Just that he will come back on a spring season. T_T no one knows that this was mesani's plan except i think the turtle friend he went with on the journey (to know how to cure the mc from the previous god he served)
I forgot to mention that even though JG's soul was healed by mesani. He's no longer immortal as the god of calamity is gone.
JG went to the library where he and Taehee first met. He asked taehee to grow old and die with him.
Somebody spoil me plz