Maybe what I said is not giving you an idea, it's more like my opinion. It was good that you added Chang-joo into the story. They could have fight about this matter if In-sung found about that dinner. Jealousy In-sung must be cute and probably scary at the same time. I personally like a story with some conflicts in it, even so, just make sure you would make them a happy couple in the end. Actually, I'm curious about public's reaction if they found out about their relationship. But, it's up to you to make it longer or to make it have more conflicts, or if you want to end the story soon. Whatever your decision is, I'm will fully support your story. Fighting chingu!!

A dark, moody guy who has the hots for a new girl in town, but he tries to stay away from her because he’s dangerous. When he can’t help himself, and his enemies go after her, he will do anything in the world to protect her.
That's just one I had lying around :)
You can use it, or alter the idea or whatever. You don't even have to use it, but if you don't feel free to give it to someone else!