This drama featured Lee Hyeri (Deok-sun) and Park Bo-gum's (Taek) first ever kissing scenes since they debuted in the entertainment industry.
Ryu Hye-young (Bo-ra) and Go Kyung-pyo (Sun-woo) went to the same university and are friends in real life.
Lee Hye-ri (Deok-sun) was in a relationship with Ryu Jun-yeol (Jung-hwan) from late 2016 until November 2023.
Lee Mi-yeon, who played the adult Deok-sun was a household name in South Korea during the 1980's.