- HeeJin & HyunJin
- Idarui Sonyeo (HeeJin & HyunJin) (이달의 소녀 (희진&현진))
- Danyeogayo (다녀가요; Around You) (HyunJin)
- I'll Be There (HeeJin & HyunJin)
"Idarui Sonyeo (HeeJin & HyunJin)" is a single released by HeeJin and HyunJin. It is the third single released by the group LOOΠΔ as part of the promotion leading up to their debut.