ald1 - where were they known before?

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Across
  1. 1. makemate1 contestant and ranked 10th in the final and was unable to debut in nouera
  2. 4. ranked 9th on under nineteen, debuted as a member of 1the9, then debuted as a member of wei. starred in secret relationships
  3. 6. trainee a member, model
  4. 8. member of boy story under jyp entertainment and ncc
Down
  1. 2. makemate1 contestant and ranked 14th in the final, was unable to debut in nouera. c-group signal song center. pre released visual poster
  2. 3. k-group signal song center
  3. 5. pre-released visual poster, child actor in commercials
  4. 7. trainee a member, participated in rap public, soloist under 131 entertainment, toured with b.i. appeared in bts' permission to dance music video