Norris Moore is a home-loving person who cherishes old ties. Although Luke Moore is biased and heartless, he has raised Norris with kindness, never neglecting her upbringing or material needs. If Norris ever found out that Luke had exploited her, it would probably take her a very long time to get over it given her personality.
The revenge he once took on the Moore Family has become something he regrets immensely. Even though he might never have met Norris if it hadn't been for Luke, she genuinely suffered a lot because of him.
The man she treated like her own father pushed her to be his human shield, enduring too many torments not meant for her. He swore to make it up to her, but for Norris, some things might be better left unknown.