Rubuta ci gaba don wannan sakin layi - Heo ya wakilci Koriya ta Kudu a 2012 FIBA Under-17 World Championship, inda ya samu maki 17.7, 2 rebounds da kuma taimakawa 2.9. Heo ya kuma halarci Gasar Cin Kofin Duniya ta FIBA Under-19 ta 2013
, inda ya samu maki 12.8, 3.4 ya sake dawowa da kuma taimakawa 3.2.