what was og cheon yise even sick with? he died to overdose and then he got sick because of...

what was og cheon yise even sick with? he died to overdose and then he got sick because of the system backlash what? then his mom who looks older adopts the newborn cheon yise in another timeline where yise did die?? what happened to im hyunsungs temporary body did he evaporate what
such a nice story though i adore shim naru
reminds me of strawberry crepe cookie from crk