(↓This review contains serious spoilers, please choose with caution whether to watch or not)
In the ending of choosing to listen to Forcas and not save the man in the cage, we can see that at the end Forcas says to us: "I'm sorry, Angelica.It will be painful, but until the day I can properly salvage you, you must persevere". So we can be sure that Angelica is the poor nun who was robbed of her body.
It is mentioned in the game that fallen angels will rob the bodies of living people in order to survive in the human world. These fallen angels will bewitch humanity and deceive them into resurrecting their loved ones by simply offering a body. And the fallen angels, after successfully attaining the new body, will pretend to be the resurrected one. In fact, the pastor and the others were deceived into thinking that the soul in the new body was the priest's wife who had risen from the dead, but in fact the dead pastor's wife would never come back, and the soul that had taken over the new body was nothing more than the fallen angel, who was just pretending to be the resurrected one.
Angelica is the poor nun who was sacrificed to the fallen angel in order to resurrect the priest's wife, but fortunately she is not completely dead, her consciousness and the fallen angel exist in this body at the same time. In the ending of choosing to save people, people will find out that Angelica, who should have died, is still alive, and people will kill the real Angelica, so that the fallen angel will completely take over this body. Everything is a hoax, and if the real Angelica is a kind nun, then her kindness will make her die completely, on the contrary, if she completely ignores the poor person who is frantically begging for help, she can save herself from death, which is ironic.