Ding-dong, ding-dong-ding-dong, ding, dong. Ding-dong, ding-dong-ding, dong-ding, dong.

It was late at night.
The old building echoed with the grating sound of a worn-out doorbell.
Worried that the neighbors might be disturbed, Ji Hee-jin cautiously opened the front door.

“Who’s there…?”

“Noona, it’s been a while.”

After five years apart, Ji Hee-jin and Ji Hyun-woo, who had once lived together as step-siblings due to their parents’ remarriage, meet again.

Now a handsome medical student who’s returned home in glory, Hyun-woo approaches a drunken Hee-jin and whispers—

“This time, let’s become family not as siblings… but as husband and wife.”