[English is not my first language. But since I have studied English for 10 years, you people probably may not find any mistakes here. I started learning English at the age of 3. I am a 2007 liner. Comment if you are too. Btw this is my first ff.]
Byun Jeonghyo [ Main female lead ]
Kim Taehyung [ Main male lead ]
Other characters:
I think I will spoil the fun if I tell about them now. So it will be better to know them by yourselves.