3H (HeeJin, HyunJin and HaSeul) is the friendship between HeeJin, HyunJin, and HaSeul.

Other NamesEdit

  • 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. 


  • HeeJin and HyunJin have jin (진) in their names, but HaSeul doesn't.
  • HaSeul is the only 1997 liner in 3H.
    • HeeJin and HyunJin are in the '00 line.
  • 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.

See alsoEdit

Check out the gallery of 3H !
Community content is available under CC-BY-SA unless otherwise noted.