Okay this might seem odd as they just debuted, but on Girls Planet 999 theres a Cube trainee named Lee Yunji.
If she becomes somewhat popular, maybe Cube will add her to Lightsum
Maybe she didn't make the cut like Yeonjung didnt make the cut for WJSN at first.
She fits in terms of age (Lightsum 2002-2006) and Yunji is from 2002
