Saved by the Powerless Little Lady

Although she was born into the renowned House Arachne, poor Riersha is shunned by her family for not having powers like them. But when a previously loyal aide betrays House Arachne, she learns her family was actually trying to protect her all along...! Once she dies by the aide's sword, Riersha wakes up in the past as a four-year-old and discovers that she does have a special power, although she's not quite sure what it does. Now, little Riersha must save her family by getting the traitorous aide on her side and using her mysterious power to protect them...

(Source: Tappytoon)

Note: First released in English, with the initial eligible release in Korean.