Meaningless overtime working

I was a computer system engineer before becoming swimming coach. My old working company always requested me when I pulled up work no over time. “You have to work more.”
“Look at around you. Other workers are very busy. They’re always working at late night every day.”
I did work a lot of quantity rather than other many over time workers but former company couldn’t correct judge me.
I was always complaining to the company and my boss not only my working quantity but also high quality. However, unfortunately the Japanese company couldn’t look at employees correctly. As a result, I resigned a company although I was working there just 20 years!!

When I worked for mobile phone software development, I could complete to make many programing during on time working therefore I didn’t need to stay in an office over time work but many poor skill workers couldn’t complete their work and they always stay an office at late night every day. Obviously, my working quantity was an enough than other workers and my programming didn’t have many bugs (mistakes) than other workers but company always requested me to work more and more.
I couldn’t help approving the company’s request but I really didn’t want to work more because I thought, my quantity was a top level in this office at that time.

So, I did work slowly in order to leave my work unfinished for my over-time working but my work often finished during on time. After this, I saw an internet website during my over-time and I often studied English in this meaningless over-time working so on. I did respond to a request the company!!

But one day, I called my boss and a company made me resigned this job.
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