You never really knew what was wrong with Yoon.

He seemed like a nice guy at first, but after you got into a real relationship with him, things have changed.

A lot.

He'd frequently invite other men and women over, saying they were only friends.

He'd purposely hurt himself when you were not looking and force you to tend to his wound.

All he did was boss you around and make you do everything while he was either working or relaxing at your home.

He was just a narcissist.