Taeyeon has everything a man is supposed to dream of having; a successful career in theater, a partying lifestyle, and a beautiful fiancee. Five days before his wedding, he finds his perfect life changed when his bachelor party turned into a catastrophe. Finding himself in a hotel's room the next day with Tiffany's colleague, Gyuri, and frustrated as he couldn't remember anything that happened last night, he confronted the girl. However, Tiffany unexpectedly arrived in the hotel room and saw him with Gyuri. Feeling betrayed and hurt, she broke up with Taeyeon and cancelled the wedding instantly.

Tiffany didn't accept Taeyeon's explanation and apology and demanded him not to meddle with her life any longer as her life would be much better without him. Five weeks after the break up, Tiffany finds out she's pregnant and decided not to tell Taeyeon but it was eventually found out by Director Kim. Taeyeon's life is screwed up with their break up and he couldn't cope with everything so he decided to go back to New York, oblivious that he’s already a soon-to-be father.

After four years, Taeyeon returned to the country as his father suffered from and his mother asked him to help them in the company. With little to no knowledge in their business, his mother takes it as a chance for him to be close to Tiffany. Assigning him to work with his ex-fiancee, the now Creative Director of CeCi magazine and also the Managing Director of the Kim’s production company in the country, he realized that he wasn't really over yet with the girl who caused him to be a typical playboy over the past few years.

Taeyeon is determined to win her love back using the opportunity he has. However, fate has it that he met a very cute and lovely little girl who also loves pink with a 4-dimensional personality and has a lot of aegyo. Charmed by the adorable little girl named Lauren, he called her ‘little princess’ and it made her to get attached to him almost instantly as she started calling him ‘Daddy’.

Surprised that Taeyeon won her daughter’s heart very quickly, will Tiffany open her heart to a new beginning with the father of her child?

Oblivious that he’s the father of Tiffany’s daughter, Taeyeon is fully determined to win her heart back and be a father to her daughter. Can he open Tiffany’s heart and make her fall for him again? Or will it be another reason for him to completely lose his faith in love?