Riri actually wants to get along with Yeon but she’s just too shy to be direct, that’s...

I got that vibe too. RiRi’s spoiled but she’s pretty pure hearted after all she doesn’t have to deal with any other girl in the household aside from Yeon who acts completely like an aloof Aunt than a cousin competing for favor. Plus Yeon’s pretty soft on her. She probably wants to stick to Yeon but is too prideful and shy lol