Three actors from this drama where in Crash Landing in you. The couple who's breaking up in the first episode was also a couple in Crash Landing
In Seo Ji Hye's interviews, the actress revealed that a lot of scenes from the drama was an adlib. Like the scene where Hae Kyong (Song Seung Hoon's role) wore a flower petal shirt. According to her it was meant to be a fur coat but it was off season so she chose the flower petal instead.