Wu Daoan was the mole in Wu Minshi's heart, but Wu Minshi was the prison that imprisoned Wu Daoan.
Shen Zhi is the threat that Shen Jin wants to eliminate, but Shen Jin is the haven for Shen Zhi's soul.
At the end of the story, Wu Daoan tore the prison apart with his own hands, and Shen Zhi also lost his harbor.
Purpose: Only by breaking free from the shackles of prison can we embrace freedom.