Soo-hyun Kim and Giana Jun previously started together in The Thieves (2012).
The fairy tale book that Do Min-jun reads in the drama is The Miracle Journey of Edward Tulane, and the ending part of the fairy tale book is also cited in the ending part of the drama. And The Miracle Journey of Edward Tulane gained explosive popularity thanks to the drama and became a bestseller.
Both Kim Soo-Hyun and Kim Chang-wan (who plays his friend and "father figure") later reunited for another TV show 'Its Ok Not To Be Ok' (2020).
It is Jeon Ji-Hyun's first drama return in 14 years, who has only appeared in movies since SBS drama Happy Together in 1999.