I guess every investor has been or will be in this situation...

I guess every investor has been or will be in this situation with some stocks in his or her investment journey. My personal experience is not be too emotional and try to make the most reasonable/logical decision based on the available information.

Ultimately there are only 3 options:
1. Admit there was a mistake in purchasing the stock in the first place, sell and move on. The funds can be unlocked for other opportunities;
2. Take advantage of the low price and average down the cost, depends on the availability of funds and exposure limit to this stock;
3. Do nothing and wait for it to turn around

My personal view is that the recent price drop has pushed the stock to a fair-valued or slightly undervalued level. However the performance of the latest acquisition unit AJ Park will be critical since it was a big bet from the company.