The Fifth Friend

A solid office worker who is good at work ,
Deputy manager Jung Ji-soo, has been lonely for 7 years,
But she has secret friends who helps her to get through the lonely nights.

The first friend is an "egg vibrator" ,
the second friend is an "internal vibrator",
the third friend is a "silicone dildo", and
the fourth friend is a "suction vibrator".

And the fifth friend,
the successor to the company, Han Se-hyun...?