These three are university students that live outside the campus in the same house. Primarily, they are friends at first then turned out that they established a love triangle between the two male students and one female student.

Considering that it is their first time to experience falling in love, it is a bit complicated for them and had some confusing moments. Upon the interview, Ji Soo said that the story basically describes how young and clumsy love revolves around these three people in their 20s.

He also added that the story is a heart-warming series that people will definitely relate especially those in the age of 20s. He even elaborated on some details in Singapore at a Netflix event last year.

Kim Ji Soo is a 25-year-old man and has experienced on some of his supporting roles in the series, "Angry Mom" and "Strong Woman Do Bong Soon".
Aside from his relevant appearance to K-drama, he was also seen in Bad Guys 2 in last year's K-drama and Ping Pong Ball. He then took part in a Judo National Competitions as a teenager that leans towards action by oriented characters.

He said "Because of the way I look, I do get roles like that of a police officer. But I am more like my character in My First First Love." His character as a youngster who feels alienated from peers and others is also known as Yoon Tae Oh.

Another character from a K-pop girl group DIA that everyone will surely captivate their hearts is none other than Chae Yeon. She talked about her character in the story as Han Song Yi who has a strong-willed capability and an unstoppable girl.

Based on her interview she said that her character Han Son Yi makes a lot of mistakes all the time but otherwise, she still carries it on. Chae Yeon is naturally a bubbly and jolly one and she also elaborated that she had no hard time portraying the character because in real life that is how she expresses herself.

Jin Young added that all the production team and cast formed a great teamwork along with the series.