Now that (G)I-DLE has 5 members, there could be one member for each of the KDA members. Soyeon - Akali Miyeon - Ahri Yuqi - Evelynn Shushua - Kaisa Minnie - Seraphine
1:37 Girl with bangs and dress (Soyeon) is obviously live. Her voice is deeper than the backtrack. 1:48 Girl with leather jacket and bangs is obviously singing live (Minnie). Her voice is a bit deeper and shakier compared to the backtrack 2:36 Blond one (Yuqi) is singing live. U can tell from the heavier breathing as she moves, especially at the “POPstars” 3:59 girl with side part (Miyeon) is obviously singing live. She emphasizes “go HARD” The fifth member with a middle part (Shuhua) most likely did not sing live.