Though the man's words sounded very simple, Sun Bingwen understood the deeper meanings hidden inside them.
He softly denied him from following Shao Rong and also hinted that he was on Shao Rong's side and hence he should not doubt that he is planning anything against his boss.
After all, anyone would think that the man was trying to betray his boss by not allowing Sun Bingwen to follow and support Shao Rong. If he was a 'good' subordinate, he should not reject an ally right?
Hence the man said that everything was going according to the plan and if Sun Bingwen was to join, he may disrupt the plan instead of being helpful.
In fact in his words there is another additional meaning that Sun Bingwen had caught. He said that he should not be involved in this matter more than he already was. It clearly shows that they are trying to think about his safety and trying their best to not implicate him in the mess.