If you want to be aggressive, take action around 4125 as long as it holds and does not break; conversely, if 4125 breaks, only trade 4080–4100. If it breaks, do not act. There is heavy selling pressure at 4185–4200. In early trading, liquidity was insufficient at 4168, so it dropped. Execute your own risk-reward ratio well, and raise your stop-loss properly. If today you can see a retracement up to 4185, then there is still a possibility of moving on to 4200. The rebound may not be over yet!