These are idols I think look alike. Feel free to submit your own options and they could be added to the list. 

Pentagon's Wooseok and Pristin's  Xiyeon
 

April's Naeun and NCT's Jungwoo
 

Stray Kids' Han and KARD's JiWoo
 

Mamamoo's Solar and Gfriend's Sowon
  

Izone's Minju and Twice's Tzuyu
 

IZ*ONE's Chaeyeon and ITZY's Chaeryeong
  

Golden Child's Daeyeol and Infinite's Sungyeol
  

Stray Kid's Felix and Weki Meki's Doyeon

Fromis_9's Nagyung and Stray Kid's I.N

Seventeen's Woozi and Fromis_9's Jiheon 

OMG'sBinnie and EXO's Chanyeol

Bae Suzy and Everglow's Sihyeon 
 

Stray Kid's Han and Day 6's Young K
 

Everglow's Aisha and Somi 
 

Loona's Chuu and April's Naeun
 

Loona's Haseul and Kim Go Eun
 

Gugudan's Hana and Red Velvet's Irene 
 

Black Pink's Lisa and Nana Komatsu
 

NCT's Ten and Hinapia's Minkyeung 

April's Naeun and Kriesha Chu
 

Black Pink's Rose and Allissa Shin 
 

Cignature's Semi and Twice's Jihyo
 

Gfriend's Sinb and Mamamoo's Moonbyul
 

Rockey Punch's Sohee and Fromi_9's Jiheon
 

Gfriend's Yerin and Stellar's Minhee
 

Cherry Bullet's Yuju and Red Velvet's Joy
 

IZ*ONE's Yuri and Weki Meki's Yoojung
 

TXT's Soobin and BtoB's Minhyuk
 

Lovely's Yein and Jisoo 
 

Baro and Minho
 

Black Pink's Jisoo and Fromis_9's Gyuri