A daughter-in-law manhwa often focuses on family dynamics and the relationship between the daughter-in-law and the rest of the family. It might have elements of drama, romance, and sometimes comedy.
To survive, you should build alliances with the right characters. Also, stay away from obvious traps and don't trust everyone easily. Keep a low profile when necessary.
To suddenly meet a benefactor meant to suddenly meet a person who gave help or kindness. This phrase appeared in Cao Xueqin's " Liu Yuqing," describing how the protagonist suddenly met Granny Liu, who saved his life, and escaped the disaster. This phrase could also be used to describe someone who suddenly came across someone who could help you in life.