Dan-Han was fuming with anger when he walked back into his office. Not just anger of Eun-sun avoiding his gaze and comfortably being with In-Ha, but also that of just letting her go like that. He felt regretful for doing that. He should have done something to prevent her from going with In-Ha.
He knew his friend well and that friend of his, was a Casanova and a chronic one at that. He loved chasing after women most especially the types that weren't easy to get. The man loves the chase, he practically lived for it. And he had just let his woman go with him just like that.
In-Ha's conquest were innumerable and he wasn't going to allow his woman to be among those number. He really hated himself for letting his anger get to him.