Dinner with Co-workers

On the 11th of May, I ate dinner with my co-workers. They are both cook(it means not hall member) and student of university, one is the same grade and the other is 3rd grade. I did not have a chance like this, so I was a little surprised for the cause. As we were eating, the reason why they asked me for dinner became clear, they worried about me. Recently, I am gloomy in working, because I do not like a person who works together, and when I work part-time job my face expression is dark(I cannot notice it!). Therefore, they asked me how do you do part-time job, and they gave me a lot of information of the workplace. When I knew the reason of cause, I was very happy and I felt their affection:,-) So I got a little enthusiastic. Working part-time job is not easy, however, working part-time job is also joy like meet them:-)