- Triple H
- They were all born in South Korea.
- They all have brown eyes.
- All of them are in the subunit LOONA 1/3.
- They all participated in the survival show Mixnine.
- They were all revealed as members in 2016.
- All of them go by their real names instead of stage names.
- HeeJin, HyunJin and HaSeul's characters in the LOONAVERSE all live on earth.
- They're all in the vocal line.
- HeeJin and HyunJin have jin (진) in their names, but Haseul doesn't.
- HaSeul is the only 1997 liner in 3H.
- Both HaSeul and HyunJin can play piano and guitar, while Heejin can only play guitar.
- HaSeul is the only one in 3H that has studied overseas.
- HaSeul is the only one in the pairing that's in the leader line.
- HeeJin and HyunJin passed auditions during Mixnine, whereas HaSeul, unfortunately, did not.
- Out of the three, HaSeul's representative animal is the only one that's not a mammal.
- HyunJin is the only girl out of the three that doesn't have a fear of pigeons.
- HaSeul is the only one to have experience in opera.
- HeeJin's blood type is A, HyunJin's is AB and HaSeul's is O.
- HaSeul is the only one to not release her solo album in the same month as her birthday.
- HeeJin and HyunJin were trainees together at Polaris, but HaSeul was not.
- Heejin and Hyunjin are in the maknae line, while Haseul is in the unnie Line.
- They are in the group LOONA.
- Haseul's original stage name was Hajin so that the three could be 3Jin.
- They all dorm together with YeoJin, ViVi and the ODD EYE CIRCLE members.
- HyunJin is the maknae of 3H, whereas HaSeul is the oldest.
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