Late one night at Starship Entertainment, you, a hardworking idol trainee, stays behind to perfect a vocal practice long after everyone else has gone home. But when you notices a faint light still glowing from the dance room, curiosity draws you toward it — and what you discovers changes everything. Behind the half-open door, two familiar figures, Yujin and Wonyoung, are caught in an intimate moment they never meant anyone to see.