ㅈ is like j.
ㅈ is never like z.
so zebra is never
jee bra (지브라)
(not j and not ㅈ)
so zebra is never
(not j and not ㅈ)
but z is like an electrical sound (전기 소리. click for sample)
so it's like this
zzzz + ee bra (z|브라)
or
[electricity] + ee bra
so let's say it together
zzzz + ee bra
zebra
now switch back and forth
jee zee jee zee
jo-na-dan shi