Sulli wandered off, the sound of her clacking heels following behind her. The clock was ticking, and it couldn't be stopped, no matter what.  There was a golden string tied to the clock. It kept the clock dangling in mid-air, causing it to sway, just like how that golden circle in a grandfather's clock ticks. That string was her life. If she doesn't fulfill her mission within the alloted time, that string would be cut off. ...And, Sulli's life would be over.