I never give any drama a perfect 10 but this drama 100% deserved it.

This drama is seriously amazing. I have watch like gazillion of Kdramas for the past 15 years and I can safely said that the writing for this drama is the best that ever comes out from Korea. It is intelligent, excellently written and the clever details is just mind blowing. The writer is great at constructing plot without leaving any minor details. The script is tight, solid, complicated without plot holes and full of characters with great depth and personalities without including any questionable or dumb plot in its storyline. I have high expectation before watching the show but this drama truly exceeded my already high expectations. The writers made everyone, including the main character as the possible suspects and yet, she is still able to surprise us with the ending.

I feel like no other investigation dramas can hold a candle to this other than Signal. Other law or investigation dramas always bother me with the inaccurate technical practices and details but this drama have none of those and it didn't insult you intelligent either. It's simply a brilliant cat & mouse chase drama where both the good and the bad guys are clever.

SECRET FOREST IS PERFECT IN QUALITY SENSE -- I dont even know it is possible until I watch this drama. There's nothing to complain about the script, plot, directing and acting as it is that good.