Back in high school, Xun An and Yang Muli’s relationship fizzled out before it even had a chance to begin. After graduating college, they reunite back at their old high school, but this time as teachers. As they rekindle their long-lost affection for one another, secrets from their days as high schoolers also begin to emerge... A love story between a gifted, but devious math teacher and a passionate, but hot-headed P.E. teacher.