3 secret killers

In college, your best friend was a real tyrant; because he was always looking for trouble, he was killed by three tyrants.
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After entering high school, you simply ignored this death and moved on. One day, you were returning late and, since you were tired, you went into the elevator. There were three fairly tall guys in the elevator:
Taejin, blue hair, 1.87 m, bi, flexible and patient, extroverted.
Hyunsuk, white/blonde hair, 1.90 m, pan, ambivert, positive sign and funny.
Jaeho, green hair, 1.89 m, bi, the most clingy and the most introverted.
Good luck