.
sung hanbin (22)
- new dance instructor at fluid studio
- knows matthew from college, previously in the same crew together
.
zhang hao (23)
- manager/part-time instructor of fluid studio
- in charge of studio's operations, occasionally helps with vocal/dance lessons
.
seok matthew (22)
- former dance instructor at fluid studio
- jiwoong's fiance, taking a break from their job to settle down together
.
kim jiwoong (24)
- landlord, owns the building studio in located
- matthew's fiance, met matthew when he was helping hao find location
.
kim taerae (22)
- vocal instructor at fluid studio
- hao's junior at college, first one to be recruited as an instructor
.
shen ricky (18)
- part of the fluid crew (studio's dance team)
- started attending because gyuvin forced him but loves the studio now
.
kim gyuvin (18)
- part of fluid crew (studio's dance team)
- taerae's little brother, hao offered to let him join
.
park gunwook (17)
- part of fluid crew (studio's dance team)
- gyuvin's cousin, studying in an art school away from hometown
.
han yujin (16)
- part of fluid crew (studio's dance team)
- youngest member on the team, scouted by matthew during talent show
.