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A potential love interest. He doesn't like or care for her, straight up told her (when she was disguised as a man, offering to set Noh up with "his sister") that she was too young (she is 20, he is late 30s, his kids are 13-14) and that IF he ever got with woman it would be in his age-range (35-40).
She is still trying to sneak her way into his family, when he isn't around, by buying expensive stuff for his kids, planning to use them to pressure him into a relationship.
Frankly, if a man ever doing the exact same thing, he would be gross stalker creep, so I don't see why she should be called any different.
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The latest chapter has her dad fixed her arrange marriage to someone "suitable", so she better get married to that man and stay away from MC.
But that new guy already has beef with MC, so I hope it doesn't turn into "save the damsel and fall in love" trope (not that that stalker creep needs a saving), because that would be gross af and make me really drop this manga.
Author so far has done a really good job of making Noh a decent man and a responsible father/adult, and I don't want him to end up with someone half his age just coz ~luuurve~ and plot.
IF he HAS has to end up with someone (I hope he doesn't, but if he HAS to) it can be his Nanny (his age, raised his kids) or that Earth Ki lady (can balance his Ki, chewed up the medicine and fed him mouth to mouth). Or even his dead wife coming back as a zombie will do.
And I'm pretty sure the annoying redhead is the little girl from chapter 9. The ninja-crow bodyguard is the same.