She is a good sister and loves her brother very much.
And he was only very good and obedient in front of his sister, but he was an out-and-out gangster in front of others.
Time flies, as the younger brother actually falls in love with his sister, he drives away every man around her and explains his feelings.
What he got in return was contempt and abuse from others.
She had no choice but to escape and leave here.