The Day Time Stopped

There's a timer on your wrist. After you turn 18, the day it stops is the day you met your soulmate.

There's a tattoo on your skin, it's your soulmate's name, but it won't be revealed until you have spent enough time together. And it won't turn red until you accept each other's love.

Kongpob can't be Arthit's soulmate, because he wasn't there the day his clock stopped..was he?