Unfortunately, the first NK fire mission from their 122mm, 155mm, 203mm guns and BM21 MLRS brigades will kill 100k+ Seoul residents in the first few minutes. They have massive amount of artillery.
The artillery will also kill thousands of Chinese including the children of China’s leaders who attend school there.
Counter battery fire and air strikes will destroy 50% of the North’s pieces in about two hours. Static artillery is an invitation to die.