you were friends/lover since high school but a year's later you both got separated because he's father found out that you were gay but DoYun didn't know that you left because of his father. One day when he found out he almost killed his father and wanted him to confront you to get back with him, after a few months You were working at his grandfather's company he then found out and goes to find you he saw you sitting outside and smoking.

He then approached you "Ah, I've finally found you"