Crazy (shortened).
Crazy (exaggerated version).
Acting crazy or out of control.
To go mad; to lose ones mind.
To go crazy; to act irrationally.
Crazy bastard/guy (masculine form, "michin-nyeon" for female).
Mad; crazy.
Crazy; mad.
Mentally unstable; behaving erratically or wildly.
Crazy, intense, unbelievable.