namjoo and yookyung swapped parts during live performances and i dont understand why to this day since they get the exact same lines, but its clear who's voices are who's in the audio, i feel like even non pink pandas would still be able to recognize their voices!! so yes namjoo's first lines are sung by yookyung live while yookyung's only lines are sung by namjoo live!! and this is a remake btw!!! i still love this song and eunji's high note omg!

Members + Color Codes

Chorong (Light Blue)
Bomi (Green)
Eunji (Yellow/Gold)
Naeun (Red)
Yookyung (Purple)
Namjoo (Pink)
Hayoung (Orange)

My Bias: Chorong, Namjoo
Release Date: April 19, 2011

Translation Source 1: https://colorcodedlyrics.com/2020/04/13/apink-dumhdurum-deomdeoleom/
Translation Source 2: pop!gasa
(i won't be putting the link since its super long)