just now i meet an unhappy thing in my office. one of my colleagues who is very good at using others. there is a project in his hand, and the client need a retail list from, he push this task to our boss, letting him transfer to me to complete. i accept and try my best to do it, and even overworked last night to 9:30 pm. in this retail list, there is one item on average turnover of the store, the colleague tell me no need to find them. so last night when i complete it and sent by mail to my boss, at the same time i explained why i did not fill in the turnover. however, this morning, he never said thanks to me for helping him complete so large task, he show anger to me and did not confess it, he sent many mail to me and cc to our boss in order to shirk his responsibility. it is just a little thing, and boss never thought bad about his ever thought, it is just no need to immediately shirk any responsibility and give me angry face to me.  to me sad is that what i get is just his angry face after a long time overworking. especially i am a patient with a bread cancer, i can sacriface my rest time to help him, while he never said a thanks to me, just give me an anger.