Thsi is the third time that scriptwriter Park Hye Ryun and Lee Jong-suk have worked together after I Hear Your Voice (2013) and Pinocchio (2014).
This is a fully pre-produced TV series. Filming began in February 2017, while Lee Jong-suk joined filming on March 2. Filming wrapped up on July 27 at Wonbang set in Paju, after five months of filming.
This is the second collaboration between singer-actress Bae Suzy and scriptwriter Park Hye Ryun after working together in the hit series Dream High (2011).
First script reading took place on January 20, 2017 in Mokdong, Seoul, South Korea.
This was the second drama where Sin Jae-ha and Kim So-hyun appeared together, after KBS's 3-episode Page Turner (2016).
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