One person's mood can easily affect others. We all have such experience that if you stay with a positive person, you would be positive, while if you stay with a negative person, you would be enveloped by negative emotions.
My new roomate, is not a very positive person. She often complains she's very tired, she feels bored or she gets old. Everyday, she gets up very late, and she always ask me why you can get up that early, what you get up that early for. After work, she would stay at the dormitry watching entertainment programs until she feel sleepy. She likes to say, from tomorrow, she would make some change, while there're always tomorrows.
And my colleague in the same office room with me, is also a negative person. Different from me, she's from a rich family, and she needn't worry about anything. So, for her, attending to work is just a way to earn some pocket money. She comes to work late in the morning, has lunch on time, oversleeps more than thirty minutes in the afternoon, and goes back home when it's five thirty. She never starts a work if not demanded to do. As if she is free all the day, sitting in her chair slackly watching Korean TV programs and enjoying all kinds of snacks. And she always kids me about my boring and busy life.
Honestly, I'm more or less affected by them. I can't keep a distance from them, because I have to be together with them every day. Affected or not, I think it all depends on my determination. I should always keep a fresh mind when together with them, and always know exactly what kind of life I want to live. Whatever, I want to be a positive person.