1.5 minutes and 32 seconds Dr. Yang, have you ever heard that someone can drown himself in the bathtub? -this passage coincides with the method of brother Guo Zhihua's murder of his brother. Does it imply that my brother buried his back in his heart and committed suicide in what way? It's like a seed. It's a psychological strategy to make his brother kill him unconsciously in the way his brother preset. So my brother has already figured out how to play dead and jump out of this game.
At 2: 52: 23, Guo Zhida escaped by explosion. Can't you see there's only one handcuff? Where's the other one? Is it very similar to the bracelet in the ending?
3. The gambler's three-level realm at the beginning also implies Guo Zhida's "fear of losing", which fits the theme of reversal very well.