abeonim - father (Formal) when referring to someone else's father
abeoji - father (Formal) when referring/talking to your own father
appa -father (Informal) similar to dad. when referring/talking to your own father
***
It was past midnight. Min-jun had come down to drink a glass of water. From the kitchen, he noticed the dim light of the office room.
He quietly walked over and stood in the doorway, looking at his father.
They had not talked to each other since Min-jun's father came to visit Min-jun at the hospital.
"Appa…" Min-jun spoke quietly, and Min-hyuk raised his head, looking tired.
"Ah.. Jun-ah. Why are you awake?"
"I was studying. I came down to get a glass of water."
Min-hyuk looked at his son and smiled affectionately.
"Come… Take a seat. Let's talk for a while."
