Title track "Kiss Later" is an upbeat and lively candy-pop song, containing YeoJin's own uniqueness. The lyrics express an appropriate and healthy attitude telling a boyfriend that "we're still young, so let's study hard and get into college before kissing".
The music video of "Kiss Later" was produced under the direction of Digipedi, the nation's top music video producer, and contains fancy cinematography befitting YeoJin with the fairytale "The Frog Prince" as motif.
Roseade's Analysis on Amino
In the M/V, it is seen that YeoJin is being chased by a frog. In one scene, the frog is seen upside down in a purple suit, percieved to be Choerry (as her animal is a fruit bat and her color is purple). The frog is trying to make her sin, so that is why YeoJin keeps running away. YeoJin doesn't want to sin, but at the same time doesn't want to reject the frog, almost making her do the kiss multiple times. But, we never see YeoJin actually kiss the frog, making it better to assume she didn't sin (another reason why she might not be seen much in the LOONAVERSE).