Harley Quinn x Joker: Mad Love

After splitting with The Joker, Harley Quinn joins the evil crime lord, Black Mask. Devastated, The Joker searches for Harley's replacement in order to make Harley Quinn jealous.
The story is like a sequel to Clown Prince of Crime (story here in Wattpad), it takes place sometime after Suicide Squad and it borrows the idea from Birds of Prey (and the Fantabulous Emancipation of One Harley Quinn).