"Pay attention to using your microexpressions to transmit your emotions instead of using big movements or big expressions. At the same time, you can also use other actions like lowering your head or turning your head to hide your emotions."
Ji Jun continued to guide Yu Han. "And most importantly, you're not only facing Gu Su, but also the audience. Hence, the effect you have to show to both sides is different. To Gu Su, you're the silent and stubborn traitor Liu Mei, but to the audience, you're the undercover Liu Mei, who has many emotions but can only hide them under a calm surface."
Many actors did not realize this problem when they were acting. Or even if they did, they could not comprehend the techniques inside. Hence, the effect was not satisfactory when they were acting.