Responses

From what I’ve gathered, the female lead is the goddess’ daughter. Because of a bet the goddess made with the male lead, the goddess’ goal is to possess or take over the female lead’s body. As of now, it seems the goddess is trying to accomplish this under the guise of granting the female lead saint-like powers.
the first older brother was attempting to kill the fl using the sword. however the fl was suddenly able to use the goddess' power (the sparkling glow on her hand) so she prayed for the goddess to help her if she was actually seeing what was happening. the goddess helped her which is why the brother's sword was flung away from the fl lead's body when it came into contact with her. the power of the goddess also heals the cut on the fl's neck from the sword. you also see the second brother running and entering the room at the end, he realized the first brother's plan to attack the fl and wanted to stop him.
minor spoiler below for relationship between fl and goddess:
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the reason the goddess helps the fl is because the fl is the daughter of the goddess (currently under the guise of the fl being a saintness)