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Basically, Jungmin begins dating his best friend after having a falling out with Saro. Best friends abuses the Jungmin a lot (beats the shit out of him at one point). Saro finds out and instead of being concerned, he is happy because that means Jungmin will come back to him. After Jungmin gets beaten really badly by his best friend/boyfriend, Saro kidnaps Jungmin and keeps him chained up in his bedroom for a while. I didn't read much past there cause both Saro and the best friend are such trash and Jungmin just keeps being played and abused.

The spoiler you read is kinda misleading?
Spoilers of the spoilers...
I just read all the raws and it is reallyyyyy slow, literally nothing eventful happens for a long time, as the story focuses on MC and Saro developing feelings for each other. Like, 30 chapters of that. Then they have a fall out due to something Saro did. In the meanwhile, it is shown that Yurim is indeed shady and is attracted to MC out of sadism and power. There's also a strange fantasy "past-live" background for MC and Yurim that I couldn't give a shit about.
Anyways, MC and Yurim seem to go on a date and Saro is pretty jealous, but nothing happens. Then MC and Yurim fuck once, and MC is taken a little by surprised in an uncomfortable way by how marky Yurim is (lots of bites and kiss marks on easy to see places). The next chapter, MC goes and talks to Saro and Yurim finds them. He is angry with MC and slaps him once. He apologizes immediately but MC grows some balls and takes his distance. Then MC gets drunk and Saro indeed kidnaps him and lock him in his house, I assume out of extreme jealousy and actual worry of Yurim hitting MC or something?? And that's the last chapter of the raws. It is not romantazied and MC is pretty freaked out about now.
This creepy stuff literally happened in the last 3 chapters or so, so I don't think it really represents the 40 chapters of development of the story.
Read the raws and have decided to stop reading this one. It is seriously messed up.