His expression was gloomy, as if there was some problem.

I plan to move my address next week.

He walked around the room melancholically.

He spent the day in a melancholy mood.

He was walking around the room melancholically.

He has been melancholy recently and doesn't feel like enjoying anything.

His phone rang while he was in the middle of a meal.

He left the station, departing from behind me.

He was standing behind me.

Let's meet later.