It make sense that she have this childish side or she acts like a child despite being a reincarnator. A child's brain is just biologically different than that of an adult, and she's 17 (19 in korean age) when she died so she's also that of a teen.
Since she didn't wake up in another's body after dying, but more like a child who's past life memories was inserted to her quite suddenly. In a sense, she's still just a child in body and nature.
It make sense that she have this childish side or she acts like a child despite being a reincarnator. A child's brain is just biologically different than that of an adult, and she's 17 (19 in korean age) when she died so she's also that of a teen.
Since she didn't wake up in another's body after dying, but more like a child who's past life memories was inserted to her quite suddenly. In a sense, she's still just a child in body and nature.