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The one who give the ring to the ML (forgot his name, but he was a count), he will kidnapped Mc. He is a dark/black magic practitioner, and because they believed that what happened to Mc have something to do with being immortal, he was interested because he had been researching of a way to become immortal, that's why he kidnapped the Mc, ML have a hard time finding MC because he didn't know who kidnapped the Mc, which by the way the second time the Mc was kidnapped, the first one who kidnapped the mc was already in jail, that's why it took him some time to find Mc. Eventually, mc escaped and ML found him. Then, something happened and mc go back to Korea. Upon coming back he was so depressed and he's missing the ML so much.
Hmmm, maybe that's all for now hahahahaha.
WHAT DO YOU MEAN HE WENT BACK TO KOREA?! OMG IS THIS ANGST?! A BE? WILL THEY BE TOGETHER?!
For those who replied to my comment, I'm sorry, I accidentally deleted it. Thank you for providing the raw! I'll give a spoiler to your request, I wasn't able to remember your username. I'm really sorry.