Money Flower - it's all about these reveals! But the scene when Pil Joo revels himself to his bigest enemy is absolute gold.
The Wolf - we all know who the ML is but the FL still aloows herself to be fooled
Warrior Baek Dong Soo - you may know that Yeo Woonn's secret will come up eventually but when it does - the impact is almost as shattering for the audience as it is for his friends
The Worst of Evil - we know who is who from the beginning, the SML (and our antoagonist) not until the very end. But his reaction is... OMG.
The Rise of Phoenixes - the reveal of FL identity changes everyting and both her and ML reactions are huge emotional blow
Same with The Princess's Man (the reval here is knife to the heart)
The King in Love - everyone hides their identy for a good chunk of time. But when ML finally sees the truth about some relationships , that is a memorable moment
Nirvana in Fire - alll reactions to the truth of ML identity are priceless: be it Princessr Nihuang, Prince Jingyan, his mother or the emperor. Also some character have really strong reactions to the revelation about his true loyalty
Good Bye, My Princess - this is a twisted reveal - both FL and ML don't know about their shared past. WHen they do rmemember ( at different times) it's huge every time..