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So Kang Giha's father and his mistress/ assistant did intensive research on healers and found that there are 3 types of healers: the first one can sing songs to heal, the second can sing songs to kill whereas the third one can do both but their singing have drug like effects on their listeners with side effects like headache, tinnitus etc. Yes it has been heavily implied that YABA(MC) IS THE 3RD TYPE OF HEALER. His screams can kill people. Kang Giha had been searching for that type of healer as he can use them as contract killers. He thinks Cocaine has that ability hence the microchips. The idea of microchips was not of the owner, as Yaba heard but was actually of Imsoo, Kang Giha's loyal subordinate.