Dear Mr.wang,
After serious consideration,I decided to end my work ahead of schedule.Maybe it is really a surprise for you,however,I need to tell you that the work is not what i expected.Sorry to bring you the inconvenience.
During seven months work in your team,I have learned a lot about how to work in a world-famous company .Also after witnessing the whole progress of our group,I have learned the cruelty of competition in industry.Its obviously true that I can still learn a lot if I continue work in your team.But i really need to get a job i have long being desired for.I will be dedicated to hand over all my work to the responsible personnel before departure.
Thanks again for you kindly instruction and support during my work.Wish you very success in future.
Best regards!
Sincerely yours
Li-ming