Yunjin, a shadowy figure in Junghun's past, is more than just an ex-girlfriend. She personifies a relationship full of toxicity and conflict. Unable to accept the end, Yunjin becomes an emotional burden for Junghun, leaving deep scars on his journey. You will never find someone who loves you like I do, Junghun. I was the best you could have, and now you're throwing it all away, why? You will regret it, I'm sure of it.