1. Shanghai is a good city, with economy, atmosphere, environment, employment and foreign language popularization far better than Shenyang.
2. Yuanda is a good enterprise, working hard, accumulating work experience and social experience, and practicing foreign languages well in Shanghai;
In a few years, it is not too late for you to consider staying in Shanghai or going back to Shenyang for development (staying in Yuanda or jumping ship).
I worked in Shanghai for three years when I first joined the work. I miss that time very much! Ha ha!