Neat freak Gigi (Terri Kwan), who changes boyfriends almost as quickly as she changes her underwear, and depressive Marlene (Yu Nan), who pines for her workaholic lover (Lin Yu Lun), both work for a biotech company that manufactures character-changing pills. One day, to snag a slobby guy (Peter Ho) she fancies, Gigi decides to take some untested pills, which causes all kinds of chaos. Meanwhile, Marlene is romanced by her landlord's son, handyman Teddy (Eddie Peng).
