What are some good convenience store food recommendations?

So I'm currently in the planning phase of a solo trip to South Korea next year, ideally I'm aiming to come around April/May. My flight if on schedule would arrive at 7:45pm South Korea time and I'm guessing with immigration and the journey to the hotel I won't put my bags down before 10pm at earliest. I was thinking with it being my first night as well and after the journey I'd be so sleepy that it'd be better to just get some food from one of the convenience stores and eat that in my room rather than find a place to eat when fatigued from the journey, so I was just wondering if any of you had any recommendations on what might be the best food and drink to get from a convenience store on my first night in Seoul? Any help on this is much appreciated :)