Season 1 of Ugly Duckling premiered on May 17, 2015.

Junita, nicknamed Junior, had plastic surgery because people said her face was fat. Without knowing that she was allergic to chemicals, it ruined her face by causing acne everywhere. It would take a year to fully recover. After the incident, nobody wanted to get close to her and whoever saw her would call her a ghost-face. She couldn't stand it so she begged her mom to let her study at a college in the countryside to avoid the social life of Bangkok, and to have face treatment done by a doctor recommended by the Ugly Duckling forum. And that's where she meets Suea, a handsome, flirty, penniless senior, who is the first person to sincerely befriend her despite her looks.

Season 2 of Ugly Duckling premiered on July 26, 2015.

After falling from a tree 6 months ago Alice now suffers having "goldfish memory". She's in fact so forgetful that she doesn't even remember her boyfriend breaking up with her 14 times already. Every time she wakes up she has once again forgotten everything besides Fuyu, who she calls her hero. But a new boy in school named Aston has now vowed to be Alice's own personal post it note to help her remember everything. Who will Alice end up choosing, her hero or her own personal post it note?

Season 3 of Ugly Duckling premiered on August 30, 2015.

After confessing her love to her crush at elementary school, Maewnam is literally crushed when the boy rejects her in front of all his friends. He calls her ugly and it’s at that moment that she decides to wear a box on her head. Maewnam is really damaged by those events and she hides behind the box, truly believing that she’s ugly.

Forced to return to school, Maewnam meets Minton and Zero. Minton is sweet, friendly, and new to the school while Zero is a notorious troublemaker who uses his fists to solve his problems. The question is: who’s the boy that called her ugly all of those years ago? Is it Minton? Is it Zero? Is it another person?

Season 4 of Ugly Duckling premiered on October 25, 2015.

Happily living alone in her family’s pension, Mami vows to die before dating a man, after her mother catches on to her secret girl crush. So her mother rents out the house to three guys in hopes to bring her daughter around. But when Mami gets pulled into someone else’s romance problems, she begs her new roommate C.U., to be her fake boyfriend.

Season 5 of Ugly Duckling premiered on December 26, 2015.

Special Episode aired after the end of the series.