This is episode 55 of 62 of Laundry for Ghosts. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Ghosts must wear specific clothes to pass on. Ghost laundry owner Se-jeong helps them. Soul Ma Do-joon, who cannot pass on no matter what, stays in the shop, aiding her with other ghosts. As they grow close, his lingering spirit turns evil, and the spirit that killed her father returns.