Why did Hua Yi live to the end?

From the beginning to the end of the film, there is always a question, who is Hua Yi, and why does he live with a group of murderous madmen who kill without blinking an eye? Is he also as murderous as they are? At the beginning of the film, it is explained that the five people are a criminal group and kidnapped a child of about five or six years old. Later, Hua Yi's first appearance was when Hua Yi pretended to fall in order to disturb the police's sight when the fathers were driving away. From this, it can be seen that Hua Yi did not want to escape the family, and obeyed the instructions of the fathers. But the actual situation is that Hua Yi has been strictly disciplined by his eldest father since he was a child, and he was locked in the basement to accept punishment. Perhaps it was because he was tortured and kept in a closed environment for a long time since he was a child, that Hua Yi had a monster in his heart, and when he first murdered, there was always a monster in front of him and he was too late to attack. This shows that his heart is kind. No matter how daddy instructs him to do cruel things, he always keeps kindness in his heart. This can also be seen from Hua Yi letting Jin Shanzi go for the first time. The director's emphasis on Hua Yi's kindness is only to contrast with Shuo Tai's cruelty. Shuotai often saw monsters when he was a child. Isn't this the same fear as Huayi's psychology? But in the end, Shuotai turned himself into a monster to drive away his inner fear. He said that you can only see monsters by turning yourself into a monster. He chose to rape Ji Soo and cut off the priest's leg. The reason he did it was only because the pastor said he was a dirty man. To retaliate against the pastor, and this is not over yet, Shuotai kidnapped the pastor and Jin Shanzi's son and raised him, just to cultivate Huayi into a dirty person, to prove that the pastor's son can also be dirty people. Shuotai insists on letting Hua Yi kill his biological father himself, which is extremely perverted. But he was wrong, Huayi didn't become a monster, and started redemption. As for why Shuotai insisted on killing Jin Shanzi, he might want to arouse Huayi's anger and make him truly capable of being his father's successor. Shuotai didn't kill Huayi in the end, not because of his father's love, but more likely because he felt that he was wrong. He thought he could train the son of the holy priest into a monster. No matter how hard he tried, Huayi's heart was kind. Always thinking of his own mother, and killing Shuotai who raised him. Shuotai failed to achieve his goal, and he died. The director let the other four fathers die and left Shuotai to create a contrast between good and evil between Hua Yi and him. The fundamental reason why Hua Yi was able to live to the end was Shuotai's change of heart that he would turn good into evil, but unfortunately he couldn't see what he wanted.
In the end, Hua Yi probably killed President Zheng to repay the kindness of his fathers for raising him.

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