Answer:
Seo-Jun just gets by in school.
Step-by-step explanation:
Seo-Jun helping out in the food truck is a positive trait, while liking to binge-watch TV shows and enjoying spending time with friends are more neutral. Liking to do certain things wouldn't make someone any less diligent. However, Seo-Jun only just gets by in school- which is a more negative trait. We don't know about his mother, but there is almost always a way for grades to improve, from studying to tutoring.