Five years ago, academy teacher Song Yeo-Dan looked out for troubled student Yun Jae-Won. But when Jae-Won began mistaking that concern for something more, Yeo-Dan knew he had to draw a firm line. Now, Jae-Won is back, and he's older, sharper, and more relentless than ever. As time goes by, Yeo-Dan can no longer ignore how much has changed. The boy who once trailed after him like a shadow now stands before him as a man, and Yeo-Dan isn't quite sure how long he can keep denying the spark.

(Source: Lezhin US)

Note: Includes three extra chapters.