The drama/romance film stars Shim Hee-sub, Jung Hye-sung, and Kil Hae-yeon, and it is both directed and written by Jung Dae-gun.
[4] Joon-ho (Shim Hee-Sub) first met Eun-ji (Jung Hye-sung) through a dating application and spent a night together.
They later had another encounter when Joon-ho applies for a part-time photographing job at a magazine.
The two developed feelings for each other, but they remained in an open relationship between friends and lovers.
The term “mates” was coined because of their avoidance of commitment in the relationship.