What is the story line and who are couple in this?

There is almost none and everyone can be paired with everyone ╮(￣▽￣)╭
don't ask ╥﹏╥

This manhwa is pure chaos

MC (Jin) lost his childhood memories (he was a menace as a child). Women are extinct in this world. People who are drug addicts can be taken over and become demons. There are security companies that deal with the demons but the main one that’s talked about here is called Scanner. Plot is kinda messy and I think any more than would be a spoiler. It makes sense when you read it. As for the main couple idk. There are couples, but once again, the plot is messy (in a good way)